CN104157374B - A kind of surface is containing the preparation of the corrosion resisting steel core aluminum stranded wire of Ni-P-phytic acid amorphous deposit - Google Patents
A kind of surface is containing the preparation of the corrosion resisting steel core aluminum stranded wire of Ni-P-phytic acid amorphous deposit Download PDFInfo
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Abstract
The invention provides a kind of corrosion-resistant ice-covering-proof surface of extreme environment use containing the steel-cored aluminium strand of Ni-P-phytic acid amorphous deposit; the steel core of this steel-cored aluminium strand and aluminium strand all contain Ni-P-phytic acid amorphous deposit through chemical plating; the anti-corrosion protective layer of amorphous of surface compact has good anti-fatigue performance; any surface finish; self-cleaning ability is strong, and manufacturing process technology is simple. The invention solves the corrosion-resistant problem that steel-cored aluminium strand surface can not be permanently effective, solved the problem of the steel-cored aluminium strand mechanical properties decrease that atmospheric corrosion, stress corrosion and the galvanic corrosion because of pitting corrosion, tide of overhead aluminum twisted wire under the extreme weather conditions such as coastal humidity and cold rain cause. The steel core of this steel-cored aluminium strand and aluminium strand all contain Ni-P-phytic acid amorphous deposit through chemical plating, and the anti-corrosion protective layer of amorphous of surface compact has good anti-fatigue performance, any surface finish, and self-cleaning ability is strong, and manufacturing process technology is simple.
Description
Technical field
The present invention is specifically related to the preparation of a kind of surface containing the corrosion resisting steel core aluminum stranded wire of Ni-P-phytic acid amorphous deposit.
Background technology
Steel-cored aluminium strand is the steel core being linked by the zinc-coated wire of core or aluminium plated steel wire, and outside is by one deck or which floor strandThe aluminum stranded conductor composition connecing. The aluminium purity that aluminum stranded conductor uses is very high, according to GB GB1179-83, and siliceous being not more than in aluminium strand0.13%, iron is not more than 0.16%, silicon adds that iron is not more than 0.26%, titanium vanadium manganese chromium sum is not more than 0.01%, and surface can form one deckFine and close passivating film, and be combined with aluminum substrate very firm, just because of this layer of natural oxide-film exists aluminium and alloy thereofConventional environment performance is stable, is not easy to be corroded, and can serve as the main conductor material of ultra-high-tension power transmission line. Steel-cored aluminium strandOn the one hand swinging and produce fretting wear and fretting fatigue under wind, freezing and other adverse circumstances factors impacts; AnotherThe function influence that aspect stands the corrosive mediums such as atmosphere moisture, chemical gas, dust and salts substances, corrodes, fromLittoral industrial area, industrial area, coastal area and rural area are arranged in order, and corrosion progressively alleviates. Fine motion and corrosion tend to produceRaw synergistic effect (fretting corrosion), the damage of aggravation wire causes the transmission of electricity accident such as broken string, disconnected thigh. Corrosion failure is steel-core-aluminium strandOne of main damage form of line. The etch state of wire has chemical attack and electrochemical corrosion, and taking electrochemical corrosion as main,And be mainly outer corrosion. In the time that air humidity is larger, conductive line surfaces moisture can be condensed into moisture film, the O of atmosphere2、CO2AndIts gas is as H2S、NH2、SO2、NO2、Cl2, HCl etc. is dissolved in moisture film with salts substances, forms Thin Electrolyte Layer. Electrolyte is thinLayer reacts and produces pitting with metal oxide film. At the inner aluminium thigh of wire and zinc-plated steel core contact layer, due to metal electrodePotential difference, also can produce contact corrosion. Aluminium thigh is corroded rear surface can produce white powder, and is covered with pit, aluminium thigh and steelCore contact layer also can produce white powder thing, and wire obviously becomes fragile simultaneously, and tensile strength obviously reduces, and can cause disconnected when seriousStrand, broken string, shortened widely service life of wire. In region following the line of the sea, the life-span is low especially especially. On island, Fujian ProvinceOne 35KV steel-cored aluminium strand only uses 5 years and just occurs disconnected strand of broken string, with respect to the service life of steel-cored aluminium strand 30-40Say, the life-span is much lower. This may with moist marine atmosphere on island and long-term 4 grades of above wind and many typhoons of summer and autumnRelevant, cause damp atmospheric corrosion, pitting corrosion and stress corrosion. It is worth mentioning that, from the corrosion feelings of every layer, inefficacy wireCondition sees, the corrosion of unlined aluminium strand is even more serious than the corrosion of outer aluminium strand, and this may also have with the gap of top layer aluminium strandClose, make corrosive medium enter internal layer surface by top layer, the corrosion product on internal layer surface cannot be discharged from gap, produces largerStress is concentrated, and corrodes more serious. Therefore for steel-cored aluminium strand, must produce on surface the resistance to pneumatic adhesion of one deck goodAnticorrosion layer, reduces corrosive medium and invades unlined aluminium strand. Along with increasing of current extreme weather conditions, steel-cored aluminium strand is proposedHigher requirement.
Chemical plating is a kind of under the state without impressed current, utilize reducing agent in plating solution on activation surface of the work fromCatalytic reduction deposits, thereby obtains the method for coating. Ni-P chemical plating be taking hypophosphites as reducing agent by the nickel in plating solution fromSon is reduced into metallic nickel, deposits on piece surface, until reach needed thickness, part is taken out, and reaction will stop.When chemical nickel plating, phosphate itself also can be reduced, and jointly deposits on the surface of metal parts, and gained coating is nickel phosphorusBianry alloy. By adjusting the content of P, just can obtain the not Ni-P coating of jljl phase. Generally for binary Ni-P, P contentExceed 8% and just can obtain amorphous deposit. Chemical plating is easy to operate, technique is simple, and chemical nickel plating can make the resistance to of aluminium and aluminium alloyErosion property and wearability have raising largely, and are not subject to the restriction of shape, are aluminium and aluminium alloy, steel part surface treatment sideLower and the most promising process of cost in method.
The mode of chemical Ni-P plating amorphous coating is a lot, fills a prescription also a lot, and the Ni-P of existing binary, also can increase Co,W, Al, SiC even PTFE etc. improves its corrosion resistance and mechanical performance. Ni-P coating technology taking steel as matrix is more ripe, andObtain extensive use [Li Ning, Yuan Guowei, Li Deyu. Electroless Nickel-Based Alloy Plating theory and technology. Harbin: Harbin industry is largeLearn publishing house, 2000]. But for nothing report on the steel core of steel-cored aluminium strand.
Late 1970s, aluminium and alloy chemical nickel-plating thereof are own through there being breakthrough technically, and have obtained extensivelyApplication. In this technology, the most important thing is reliable, reproducible pretreatment technology. Up to the present secondaryDip galvanizing technique (claiming again zincate processing) is still considered to be applicable to the robust techniques of most of aluminium and aluminium alloy. But aluminium surface causesOn close oxide-film, can not obtain in conjunction with the good coat of metal. In order to obtain the good coat of metal of associativity, necessaryFirst remove this layer of oxide-film, and ensure not regenerate before the coat of metal plates. This is the pass of aluminium and alloy pre-treatment thereofKey. Aluminium and the pretreatment of aluminum alloy technique of mature and reliable are double zincate process at present, the process flow of its chemical plating nickel-phosphorus alloyCheng Wei: pre-plating piece → oil removing → washing → alkali cleaning → washing → pickling → wash → soak zinc → wash → move back zinc → washing → secondarySoak zinc → washing → alkali electroless nickel preplating → washing → acid chemical plating nickel. The theory of chemical plating is carried out on steel-cored aluminium strand surfaceBe not reported with application study yet.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, provide a kind of surface containing Ni-P-phytic acid amorphous depositThe preparation of corrosion resisting steel core aluminum stranded wire. This coating is anti-corrosion weather resistance excellence not only, and keeps the mechanical property of steel-cored aluminium strandEnergy and electric property are constant. The steel-cored aluminium strand with amorphous deposit can keep good corrosion resistance, surfaces of aluminum after strong vibrationThere is not gap in twisted wire, is particularly suitable for the extreme atmosphere such as coastal humidity, cold rain and descends to use.
For achieving the above object, the present invention adopts following technical scheme:
, containing a preparation for the corrosion resisting steel core aluminum stranded wire of Ni-P-phytic acid amorphous deposit, first carry out steel core surface on surfaceAfter chemical plating is processed, hinge joint aluminum stranded conductor; Then steel-cored aluminium strand surface, again after chemical plating is processed, makes surface and plants containing Ni-P-The corrosion resisting steel core aluminum stranded wire of acid amorphous deposit.
Described surface is containing the preparation of the corrosion resisting steel core aluminum stranded wire of Ni-P-phytic acid amorphous deposit, and concrete preparation technology is:Steel core first, after oil removing, washing oven dry, sandblast or shot-peening, chemical plating, washing are dried, links aluminum stranded conductor; Then steel-cored aluminium strandAfter drying, make the corrosion resistant of surface containing Ni-P-phytic acid amorphous deposit through oil removing, washing oven dry, sandblast or shot-peening, chemical plating, washingErosion steel-cored aluminium strand.
Described chemical plating is that amorphous coating or the coating that coating contains Ni-P--phytic acid contains Ni-P--phytic acid-PTFE'sAmorphous coating.
The coating method of the amorphous coating that contains Ni-P--phytic acid is: in 80 ~ 90 DEG C of temperature, the condition that pH is 4.5 ~ 5.0Under, impregnated in phytic acid composite plating bath, plating 2 ~ 4h, coating layer thickness is 10-30 μ m.
It consists of described phytic acid composite plating bath: nickelous sulfate 30g/L, and inferior sodium phosphate 36g/L, phytic acid 10 ~ 25g/L,Citric acid 15g/L, lactic acid 25ml/L, sodium fluoride 1g/L, succinic acid 5g/L, propionic acid 5ml/L.
The coating method of the amorphous coating that contains Ni-P--phytic acid-PTFE is: 80 ~ 90 DEG C of temperature, pH is 4.5 ~ 5.0Under condition, impregnated in phytic acid-PTFE composite plating bath, plating 2 ~ 4h, coating layer thickness is 10-30 μ m.
It consists of described phytic acid-PTFE composite plating bath: nickelous sulfate 25g/L, and inferior sodium phosphate 25g/L, phytic acid 10 ~25g/L, citric acid 15g/L, lactic acid 25ml/L, Potassiumiodate 0.05mg/L, dialkyl benzene sulfonic acids sodium 0.05mg/L, PTFE particle 5 ~8g/L。
Electroless composite plating-PTFE(polytetrafluoroethylene (PTFE)) be that PTFE particle is scattered in Ni-P coating. Due to PTFEThe chemical stability of particulate is good, coefficient of friction extremely low (being only 0.05), and surface is can be also low and have a not feature such as viscosity, therebyNi-P-PTFE coating is used widely at many industrial departments such as machinery, weaving, chemical industry. In composite plating bath, add cationType surfactant can make PTFE particle positively charged, can make more PTFE particle deposition at metal watch under Electrostatic AbsorptionFace, in coating, compound particle content can increase. Adopt FC4 and nonionic FCl0 surfactant to mix and can obtain distribution of particlesEvenly and the higher composite deposite of content.
Beneficial effect of the present invention is:
Key technology of the present invention is to adopt chemical plating skill at the steel core through sandblast or bead and steel-cored aluminium strand surfaceArt increases containing Ni-P-phytic acid amorphous coating, and prepared aluminum stranded conductor can reach good anti-corrosion effect, whole operating process letterSingle.
The invention solves the corrosion-resistant problem that steel-cored aluminium strand surface can not be permanently effective, solved overhead aluminum twisted wire and existedAtmospheric corrosion, stress corrosion and galvanic corrosion because of pitting corrosion, tide under the extreme weather conditions such as coastal humidity and cold rainThe problem of the steel-cored aluminium strand mechanical properties decrease causing. The steel core of this steel-cored aluminium strand and aluminium strand all contain through chemical platingNi-P-phytic acid amorphous deposit, the anti-corrosion protective layer of amorphous of surface compact has good anti-fatigue performance, and any surface finish is self-cleaningAbility is strong, and manufacturing process technology is simple.
Detailed description of the invention
The present invention further illustrates the present invention with the following example, but protection scope of the present invention is not limited to following realityExecute example.
Embodiment 1
(1) 7 strand of steel core that the galvanized steel wire that diameter is 2mm strand system forms, the NaOH that is 10% through the mass fraction of boiling is moltenLiquid is processed and is deoiled for 5 minutes, and washing is dried;
(2) with quartz sand, blasting treatment is carried out in its surface, main purpose is rust cleaning, and increases the fatigue resistance of steel wireCan;
(3) amorphous coating that chemical plating contains Ni-P-phytic acid: nickelous sulfate 30g/L, inferior sodium phosphate 36g/L, phytic acid 10g/L, citric acid 15g/L, lactic acid 25ml/L, sodium fluoride 1g/L, succinic acid 5g/L, propionic acid 5ml/L; Be 80 DEG C in temperature, pH controls5, plating 2h, coating layer thickness is 10 μ m;
(4) washing, dries;
(5) steel-cored aluminium strand is 2.4mm by diameter, and outer 16 strands, 10 bursts of hinge joints of internal layer are at above-mentioned Ni-P amorphous depositOn steel core; The NaOH solution-treated that is 10% through the mass fraction of boiling is deoiled and removes surperficial dense oxide, water for 5 minutesWash oven dry;
(6) with quartz sand, blasting treatment is carried out in its surface, main purpose is to remove oxide on surface, increases the anti-tired of aluminiumLabor performance;
(7) amorphous coating that chemical plating contains Ni-P-phytic acid: nickelous sulfate 30g/L, inferior sodium phosphate 36g/L, phytic acid 18g/L, citric acid 15g/L, lactic acid 25ml/L, sodium fluoride 1g/L, succinic acid 5g/L, propionic acid 5ml/L; Be 85 DEG C in temperature, pH controls5, plating 4h;
(8) washing, dries, for subsequent use.
Detect:
By steel core and aluminum stranded conductor surface all through steel-cored aluminium strand and the commercially available same specification of chemical Ni-P plating-phytic acid amorphous depositSteel-cored aluminium strand simulate respectively littoral industrial area (3% NaCl+3%NaHSO3), industrial area (3%NaHSO3), coastal area(3% NaCl solution) and rural area (H2Etc. O) weather conditions carry out dip etching, and microscopic analysis is carried out in the surface of coating.Soak time 72h, there is not any variation in the former, the steel-cored aluminium strand of commercially available same specification is (3% NaCl+3% in littoral industrial areaNaHSO3), industrial area (3%NaHSO3) in, a large amount of bubble of emerging, corrode very serious, the size reduction of steel wire, aluminium strand,In coastal area also there is larger corrosion in (3% NaCl solution), surface occurred some corrosion apertures, this may with aluminium tableFace passivating film may destroy relevant. Even if at rural area (H2O), in, corrosion also can occur, and has lost the gloss of metallic aluminium. Tear openOpen steel-cored aluminium strand, internal layer steel core also stands corrosion, has rusty stains.
When soak time reaches 168h(7 days) after, steel core and aluminum stranded conductor surface is all through the steel of chemical Ni-P plating amorphous depositCore aluminum stranded wire is (3% NaCl+3%NaHSO in littoral industrial area3), industrial area (3%NaHSO3) in, start to occur bubble, along withThe prolongation of time, bubble is more and more. After 12 hours, active layer is washed away by bubble, starts to come off, and forms larger hole. Tear openConvince line by patient analysis, inside does not have humidity, and steel core is intact. The disconnected thigh of wire is all because steel core is corroded and causes mechanical properties decrease to cause. Steel core is intact shows that the decay resistance of this wire is very strong.
Salt spraytest condition: NaC1 solution (concentration 50 ± 5g/L), temperature is 35 ± 2 DEG C, pH is 3.1～3.3,Adopt intermittently operated, be 8h interval time, and test period is 32h. Have steel core and aluminum stranded conductor surface all through chemical Ni-P plating-The steel-cored aluminium strand surface of phytic acid amorphous deposit does not occur that any surface changes, and the surface of the steel-cored aluminium strand of commercially available same specificationOccur a large amount of white corrosion products, the latter is taken apart, aluminum stranded conductor and steel core all suffer heavy corrosion. Proceed salt mist experiment112h, has namely passed through the salt mist experiment of 144h, has steel core and aluminum stranded conductor surface and all plates through chemical Ni-P plating-phytic acid amorphousThe steel-cored aluminium strand surface of layer starts to occur corrosion aperture. Although it should be noted that the salt mist experiment that has experienced 144h, exceptHave outside aperture, steel core and aluminum stranded conductor surface are not all adhered to through the steel-cored aluminium strand surface of chemical Ni-P plating-phytic acid amorphous depositSalt and water, surface is still very clean.
Embodiment 2
(1) 7 strand of steel core that the galvanized steel wire that diameter is 2mm strand system forms, the NaOH that is 10% through the mass fraction of boiling is moltenLiquid is processed and is deoiled for 5 minutes, and washing is dried;
(2) with quartz sand, blasting treatment is carried out in its surface, main purpose is rust cleaning, and increases the fatigue resistance of steel wireCan;
(3) amorphous coating that chemical plating contains Ni-P-phytic acid-PTFE: nickelous sulfate 25g/L, inferior sodium phosphate 25g/L, plantsAcid 25g/L, citric acid 15g/L, lactic acid 25ml/L, Potassiumiodate 0.05mg/L, dialkyl benzene sulfonic acids sodium 0.05mg/L, PTFE particle8g/L, 85 DEG C of temperature, pH is controlled at 4.5 left and right, stirs plating 4h, and coating layer thickness is 30 μ m;
(4) washing, dries;
(5) plating of the aluminium strand that steel-cored aluminium strand is 2.4mm by 26 strands of diameters and the above-mentioned amorphous coating containing Ni-P-PTFEZinc steel wire strand system forms; Aluminum steel divides 2 layers of winding, outer 16 strands, internal layer 10 strands, the NaOH that is 10% through the mass fraction of boilingSolution-treated is deoiled and is removed surperficial dense oxide for 5 minutes, and washing is dried;
(6) with quartz sand, blasting treatment is carried out in its surface, main purpose is to remove oxide on surface, and increases the anti-of aluminiumFatigue behaviour;
(7) amorphous coating of chemical Ni-P plating--phytic acid-PTFE: nickelous sulfate 25g/L, inferior sodium phosphate 25g/L, citric acid15g/L, phytic acid 10g/L, lactic acid 25ml/L, Potassiumiodate 0.05mg/L, dialkyl benzene sulfonic acids sodium 0.05mg/L, PTFE particle 5g/L, 90 DEG C of temperature, pH is controlled at 5.0 left and right, stirs plating 4h;
(8) washing, dries, for subsequent use.
Detect:
By steel core and aluminum stranded conductor surface all through the steel-cored aluminium strand of chemical Ni-P plating-phytic acid-PTFE amorphous deposit and commercially availableThe steel-cored aluminium strand of same specification is simulated respectively littoral industrial area (3% NaCl+3%NaHSO3), industrial area (3%NaHSO3), edgeHaiti district (3% NaCl solution) and rural area (H2Etc. O) weather conditions carry out dip etching, and the surface of coating is shownMicroanalysis. Soak time 72h, there is not any variation in the former surface, the steel-cored aluminium strand of commercially available same specification is in littoral industrial area(3% NaCl+3%NaHSO3), industrial area (3%NaHSO3) in corrosion very serious, size reduction is obvious, in coastal areaAlso there is corrosion in (3% NaCl solution), at rural area (H2O) more lightly, there is white powder in surface in corrosion. In the time soakingBetween reach after 240h, the steel-cored aluminium strand of surface chemical plating Ni-P-phytic acid PTFE amorphous deposit is (3% NaCl in littoral industrial area+3%NaHSO3), industrial area (3%NaHSO3) in, start to occur bubble, along with the prolongation of time, bubble is more and more. After 6hTake out, Ni-P-phytic acid-PTFE amorphous deposit has crackle to occur, the visible aluminium of part cracks. Take steel-cored aluminium strand apart, steel-core-aluminiumThe inner seldom region humidity of twisted wire, suffers dielectric corrosion, and steel core is still intact, without any signs of corrosion. Although corrosion is describedLiquid enters aluminium strand inside by gap, but it is few to enter inner corrosive liquid, and can not cause corrosion to steel core.
Salt spraytest condition: NaC1 solution (concentration 50 ± 5g/L), temperature is 35 ± 2 DEG C, pH is 3.1～3.3,Adopt intermittently operated, be 8h interval time, and test period is 32h. Steel core and aluminum stranded conductor surface are all through chemical Ni-P plating--plantThe steel-cored aluminium strand of acid-PTFE amorphous deposit does not occur that any surface changes, and the surface of the steel-cored aluminium strand of commercially available same specificationOccur a large amount of white corrosion products, the latter is taken apart, inner aluminum stranded conductor and steel core are all corroded. Continuing spraying experiment observes32h, the former still keeps bright state in surface, and the latter surface is all corrosion product, after sonic oscillation cleans, the latter is completeLose hinge joint, be complete dispersity.
All there is corroding aperture through the steel-cored aluminium strand of chemical Ni-P plating-PTFE amorphous deposit in steel core and aluminum stranded conductor surfaceThe general total spraying of process of time experimental period is 240h. There are some corrosion apertures in surface now, because salt and water are at itSurface does not adhere to substantially, has greatly extended its service life.
To steel core and aluminum stranded conductor surface all through the steel-cored aluminium strand of chemical Ni-P plating-phytic acid-PTFE amorphous deposit and commercially availableThe steel-cored aluminium strand of same specification vibrates, and then proceeds salt mist experiment, and the former corrosion point occurs in the time of 196h, nowSome separates coating and matrix, and the latter occurs that the time of corrosion point is very short, just occurred, and the latter takes apart after 8h salt fogAfter, find also corrosion of inside.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change withModify, all should belong to covering scope of the present invention.
Claims (5)
1. surface, containing a preparation for the corrosion resisting steel core aluminum stranded wire of Ni-P-phytic acid amorphous deposit, is characterized in that: first by steelWicking surface carries out after chemical plating processing, hinge joint aluminum stranded conductor; Then steel-cored aluminium strand surface, again after chemical plating is processed, makes surfaceContaining the corrosion resisting steel core aluminum stranded wire of Ni-P-phytic acid amorphous deposit;
Concrete preparation technology is: steel core first, after oil removing, washing oven dry, sandblast or shot-peening, chemical plating, washing are dried, links aluminiumTwisted wire; Then steel-cored aluminium strand makes surface containing Ni-through oil removing, washing oven dry, sandblast or shot-peening, chemical plating, washing after dryingThe corrosion resisting steel core aluminum stranded wire of P-phytic acid amorphous deposit;
Described chemical plating is that amorphous coating or the coating that coating contains Ni-P--phytic acid contains the non-of Ni-P--phytic acid-PTFECrystal coating.
2. surface according to claim 1 contains the preparation of the corrosion resisting steel core aluminum stranded wire of Ni-P-phytic acid amorphous deposit, itsBe characterised in that: the coating method of the amorphous coating that contains Ni-P--phytic acid is: 80 ~ 90 DEG C of temperature, pH is 4.5 ~ 5.0Under condition, impregnated in phytic acid composite plating bath, plating 2 ~ 4h, coating layer thickness is 10-30 μ m.
3. surface according to claim 2 contains the preparation of the corrosion resisting steel core aluminum stranded wire of Ni-P-phytic acid amorphous deposit, itsBe characterised in that: it consists of described phytic acid composite plating bath: nickelous sulfate 30g/L, inferior sodium phosphate 36g/L, phytic acid 10 ~ 25g/L,Citric acid 15g/L, lactic acid 25ml/L, sodium fluoride 1g/L, succinic acid 5g/L, propionic acid 5ml/L.
4. surface according to claim 1 contains the preparation of the corrosion resisting steel core aluminum stranded wire of Ni-P-phytic acid amorphous deposit, itsBe characterised in that: the coating method of the amorphous coating that contains Ni-P--phytic acid-PTFE is: 80 ~ 90 DEG C of temperature, pH is 4.5 ~Under 5.0 condition, impregnated in phytic acid-PTFE composite plating bath, plating 2 ~ 4h, coating layer thickness is 10-30 μ m.
5. surface according to claim 4 contains the preparation of the corrosion resisting steel core aluminum stranded wire of Ni-P-phytic acid amorphous deposit, itsBe characterised in that: it consists of described phytic acid-PTFE composite plating bath: nickelous sulfate 25g/L, inferior sodium phosphate 25g/L, phytic acid 10 ~25g/L, citric acid 15g/L, lactic acid 25ml/L, Potassiumiodate 0.05mg/L, dialkyl benzene sulfonic acids sodium 0.05mg/L, PTFE particle 5~8g/L。
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| CN1228467C (en) * | 2003-04-25 | 2005-11-23 | 中国科学院上海硅酸盐研究所 | Ni-P composite coating contg. silicon carbide and PTFE |
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