CN109930143A - A kind of processing method on high-intensity fasteners surface - Google Patents
A kind of processing method on high-intensity fasteners surface Download PDFInfo
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- CN109930143A CN109930143A CN201910333063.1A CN201910333063A CN109930143A CN 109930143 A CN109930143 A CN 109930143A CN 201910333063 A CN201910333063 A CN 201910333063A CN 109930143 A CN109930143 A CN 109930143A
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Abstract
The present invention discloses a kind of processing method on high-intensity fasteners surface, comprising the following steps: 1) carries out oil processing 5-15 minutes to fastener surface using 25-80 DEG C of alkaline solution；2) using the oxide skin of sand-blasting machine sandblasting removal fastener surface；3) immersing fastener in 10-40 DEG C of phosphating solution makes its surface adhere to phosphating coat for phosphorating treatment 10-30 minutes；4) it after the fastener after phosphorating treatment being carried out water cleaning, is taken out after being impregnated 2-5 minutes using 80-90 DEG C of chromatedsolution, washes, keep the temperature 10-40 minutes in 100-120 DEG C of oven；The Hydrogen Brittleness Phenomena of fastener can be prevented while the present invention can reach enough anticorrosion abilities again.
Description
Technical field
The present invention relates to technical field of surface, are especially a kind of processing method on high-intensity fasteners surface.
Background technique
There are four types of fastener surface processing mode has altogether at present: one, blackening process, nigrescence are one kind of chemical surface treatment
Conventional means, principle are to make metal surface generate layer oxide film to reach antirust purpose to completely cut off air.Appearance requirement is not high
When can use blackening process, the surface blackening of steelwork handles, also be referred to as turning blue.But a disadvantage is that anticorrosive energy
Power is general.Two, phosphorating treatment, purpose are mainly: providing protection to parent metal, prevent metal to be corroded to a certain extent；
For preceding bottoming of painting, the adhesive force and anti-corrosion capability of paint film layer are improved；Antifriction lubrication work is played in metal cold processing
With.If leading to the anticorrosive heat-resisting quantity of surface covering but a disadvantage is that phosphating coat can be destroyed to fastener dehydrogenation
It can decline.Three, zinc-plated processing, it is zinc-plated to refer in the surface of metal, alloy or other materials one layer of zinc of plating to play a beautiful, antirust
The effects of process for treating surface.The method mainly used is hot galvanizing.Zinc is soluble in acid, can also be dissolved in alkali, therefore it is referred to as two
Property metal.Zinc hardly happens variation in dry air.In wet air, zinc surface can generate fine and close alkali formula carbon
Sour zinc film.Containing in sulfur dioxide, hydrogen sulfide and oceanic atmosphere, the corrosion resistance of zinc is poor, especially contains in high temperature and humidity
In the atmosphere of machine acid, zinc coating is easily corroded.The standard electrode potential of zinc is -0.76V, for steel substrate, zinc coating
Belong to anodic coating, it is mainly used for preventing the corrosion of steel, and the superiority and inferiority and thickness of coating relationship of protective performance are very big.Zinc
After the passivated processing of coating, dyeing or coating shield photo etching, its protective and dicoration can be significantly improved.But a disadvantage is that zinc-plated
Preceding working procedure must be high concentration pickling, this will necessarily seriously lead to the generation of Hydrogen Brittleness Phenomena.Isothermal holding can be passed through
Dehydrogenation, but it is ineffective.Four, zinc-chromium coating is applied, is a kind of novel corrosion resistant coating, compared with traditional electrogalvanizing: zinc chrome
Coating corrosion resistance can be extremely strong, is zinc-plated 7-10 times, no hydrogen brittleness, high-fire resistance, resistance to especially suitable for high-intensitive stressed member
300 DEG C of hot temperature is particularly suitable for the high strength component of automobile, motorcycle engine component, high osmosis, high adhesion, height
Anti-attrition, high weather resistance, high resistance to chemicals product stability, nonstaining property.But a disadvantage is that the surface hardness of zinc-chromium coating is not
Height, wearability are bad, it is easy to be rubbed by environment object to then falling off.And the product of zinc-chromium coating is not suitable for and copper, magnesium, nickel
It contacts and connect with the components of stainless steel, because they can generate contact corrosion, influence products surface quality and anti-corrosive properties
Energy.
So far, in such as high pressure, corrosivity is strong, high temperature, fastens used in the adverse circumstances such as long-time contact liq
Part requires to carry out certain surface treatment.Black, acid washing phosphorization is zinc-plated etc..But either which procedure, it is all desirable
The descale processing of overpickling is undergone, to reach the integrality and finish of product surface, to do for subsequent processing
Prepare.But the corrosion due to living through strong acid is impregnated, hydrogen ion can escape into metallic atom, since hydrogen is in steel
The most fast element of middle diffusion velocity, atomic radius is minimum, still has very strong diffusivity in low-temperature space.How to reach enough
Anticorrosion ability can prevent the hydrogen embrittlement of fastener again, be a technical problem urgently to be resolved.
Summary of the invention
The technical problem to be solved by the present invention is to the shortcomings that overcoming the above prior art: providing a kind of can reach enough
Anticorrosion ability while can prevent again fastener Hydrogen Brittleness Phenomena high-intensity fasteners surface processing method.
Technical solution of the invention is as follows: a kind of processing method on high-intensity fasteners surface, including following step
It is rapid:
1) oil processing is carried out 5-15 minutes to fastener surface using 25-80 DEG C of alkaline solution；
2) using the oxide skin of sand-blasting machine sandblasting removal fastener surface；
3) immersing fastener in 10-40 DEG C of phosphating solution makes its surface adhere to phosphating coat for phosphorating treatment 10-30 minutes；
4) it after the fastener after phosphorating treatment being carried out water cleaning, is taken after being impregnated 2-5 minutes using 80-90 DEG C of chromatedsolution
Out, it washes, keeps the temperature 10-40 minutes in 100-120 DEG C of oven；
5) in chromatedsolution, treated that fastener surface coats teflon coating, protects in 200-208 DEG C of oven
It is 2-5 hours warm, then take out natural cooling.
Preferably, the alkaline solution is grouped as by each group of following concentration: sodium tripolyphosphate 4-10g/l, sodium metasilicate
0-10g/l, sodium carbonate 4-10g/l, surfactant 0-3 g/l, solvent is water.
Preferably, the surfactant is polyalcohols nonionic surfactant.
Preferably, the phosphating solution is grouped as by each group of following concentration: zinc dihydrogen phosphate 96-98g/l, ammonium molybdate 7-
8g/l, magnesium sulfate 8-9g/l, calcium nitrate 25-26g/l, phosphatase 79-10g/l, nitric acid 12-13g/l, nickel nitrate 6.5-7g/l, nitrous
Sour sodium 2.5-3g/l, tartaric acid 5-5.5g/l, solvent are water.
Preferably, the chromatedsolution is the potassium dichromate aqueous solution of 2-4 g/l.
Preferably, the teflon coating is selected from the xylan1425 model of whitford company.
The beneficial effects of the present invention are: the present invention is first centainly handled the surface of high-intensity fasteners product, pass through
Alkali cleaning is deoiled, scale removal, carries out the coating of alramenting film, then adds polytetrafluoroethylene (PTFE).It can satisfy special harsh
Under environment, corrosion-resistant and high-temperature resistant and the demand that still can keep product stability.It is goodlooking smooth, and because phosphating coat
Adhesive force, sticking together closely for polytetrafluorethylecoatings coatings, is difficult to fall off.And whole flow process is not present not over pickling
The hidden danger of hydrogen embrittlement.
Specific embodiment
The present invention is described in further details with specific embodiment below, but the present invention is not only limited in detail below in fact
Apply example.
Embodiment 1
A kind of processing method on high-intensity fasteners surface, comprising the following steps:
1) oil processing is carried out 5-15 minutes to fastener surface using 25-80 DEG C of alkaline solution；The alkaline solution by with
The each group of lower concentration is grouped as: sodium tripolyphosphate 4-10g/l, sodium metasilicate 0-10g/l, sodium carbonate 4-10g/l, surface-active
Agent 0-3 g/l, solvent are water.The surfactant is polyalcohols nonionic surfactant.
2) using the oxide skin of sand-blasting machine sandblasting removal fastener surface；
3) immersing fastener in 10-40 DEG C of phosphating solution makes its surface adhere to phosphating coat for phosphorating treatment 10-30 minutes；The phosphorus
Change liquid to be grouped as by each group of following concentration: zinc dihydrogen phosphate 96-98g/l, ammonium molybdate 7-8g/l, magnesium sulfate 8-9g/l, nitric acid
Calcium 25-26g/l, phosphatase 79-10g/l, nitric acid 12-13g/l, nickel nitrate 6.5-7g/l, sodium nitrite 2.5-3g/l, tartaric acid 5-
5.5g/l, solvent are water.
4) it after the fastener after phosphorating treatment being carried out water cleaning, is impregnated 2-5 minutes using 80-90 DEG C of chromatedsolution
After take out, wash, keep the temperature 10-40 minutes in 100-120 DEG C of oven；The chromatedsolution is the dichromic acid of 2-4 g/l
Aqueous solutions of potassium.
5) in chromatedsolution, treated that fastener surface coats teflon coating, in 200-208 DEG C of oven
Middle heat preservation 2-5 hours, then takes out natural cooling.
Embodiment 2
A kind of processing method on high-intensity fasteners surface, comprising the following steps:
1) oil processing is carried out 5-15 minutes to fastener surface using 25-80 DEG C of alkaline solution；The alkaline solution by with
The each group of lower concentration is grouped as: sodium tripolyphosphate 4-10g/l, sodium metasilicate 0-10g/l, sodium carbonate 4-10g/l, polyalcohols
Nonionic surfactant 0-3 g/l, solvent are water.
2) using the oxide skin of sand-blasting machine sandblasting removal fastener surface；
3) immersing fastener in 10-40 DEG C of phosphating solution makes its surface adhere to phosphating coat for phosphorating treatment 10-30 minutes；The phosphorus
Change liquid to be grouped as by each group of following concentration: zinc dihydrogen phosphate 96-98g/l, ammonium molybdate 7-8g/l, magnesium sulfate 8-9g/l, nitric acid
Calcium 25-26g/l, phosphatase 79-10g/l, nitric acid 12-13g/l, nickel nitrate 6.5-7g/l, sodium nitrite 2.5-3g/l, tartaric acid 5-
5.5g/l, solvent are water.
4) it after the fastener after phosphorating treatment being carried out water cleaning, is impregnated 2-5 minutes using 80-90 DEG C of chromatedsolution
After take out, wash, keep the temperature 10-40 minutes in 100-120 DEG C of oven；The chromatedsolution is the dichromic acid of 2-4 g/l
Aqueous solutions of potassium.
5) in the xylan1425 model polytetrafluoro of chromatedsolution treated fastener surface coats whitford company
Ethylene coating keeps the temperature 2-5 hours in 200-208 DEG C of oven, then takes out natural cooling.
Embodiment 3
A kind of processing method on high-intensity fasteners surface, comprising the following steps:
1) oil processing is carried out 15 minutes to fastener surface using 80 DEG C of alkaline solution；The alkaline solution is by following concentration
Each group be grouped as: sodium tripolyphosphate 4-10g/l, sodium metasilicate 0-10g/l, sodium carbonate 4-10g/l, surfactant 0-3
G/l, solvent are water.The surfactant is polyalcohols nonionic surfactant.
2) using the oxide skin of sand-blasting machine sandblasting removal fastener surface；
3) immersing fastener in 40 DEG C of phosphating solution makes its surface adhere to phosphating coat for phosphorating treatment 30 minutes；The phosphating solution by
The each group of following concentration is grouped as: zinc dihydrogen phosphate 96-98g/l, ammonium molybdate 7-8g/l, magnesium sulfate 8-9g/l, calcium nitrate 25-
26g/l, phosphatase 79-10g/l, nitric acid 12-13g/l, nickel nitrate 6.5-7g/l, sodium nitrite 2.5-3g/l, tartaric acid 5-5.5g/
L, solvent are water.
4) after the fastener after phosphorating treatment being carried out water cleaning, using the potassium dichromate aqueous solution of 80 DEG C of 2-4 g/l
Dipping takes out after 3 minutes, washes, keeps the temperature 10-40 minutes in 100-120 DEG C of oven；
5) in potassium dichromate aqueous solution, treated that fastener surface coats teflon coating, in 200-208 DEG C of oven
Middle heat preservation 2-5 hours, then takes out natural cooling.
The above is only feature implementation examples of the invention, are not limited in any way to the scope of the present invention.It is all to use together
The technical solution formed Deng exchange or equivalence replacement, all falls within rights protection scope of the present invention.
Claims (6)
1. a kind of processing method on high-intensity fasteners surface, which comprises the following steps:
1) oil processing is carried out 5-15 minutes to fastener surface using 25-80 DEG C of alkaline solution；
2) using the oxide skin of sand-blasting machine sandblasting removal fastener surface；
3) immersing fastener in 10-40 DEG C of phosphating solution makes its surface adhere to phosphating coat for phosphorating treatment 10-30 minutes；
4) it after the fastener after phosphorating treatment being carried out water cleaning, is taken after being impregnated 2-5 minutes using 80-90 DEG C of chromatedsolution
Out, it washes, keeps the temperature 10-40 minutes in 100-120 DEG C of oven；
5) in chromatedsolution, treated that fastener surface coats teflon coating, protects in 200-208 DEG C of oven
It is 2-5 hours warm, then take out natural cooling.
2. the processing method on high-intensity fasteners surface according to claim 1, which is characterized in that the alkaline solution
It is grouped as by each group of following concentration: sodium tripolyphosphate 4-10g/l, sodium metasilicate 0-10g/l, sodium carbonate 4-10g/l, surface
Activating agent 0-3 g/l, solvent are water.
3. the processing method on high-intensity fasteners surface according to claim 2, which is characterized in that the surfactant
For polyalcohols nonionic surfactant.
4. the processing method on high-intensity fasteners surface according to claim 1, which is characterized in that the phosphating solution by with
The each group of lower concentration is grouped as: zinc dihydrogen phosphate 96-98g/l, ammonium molybdate 7-8g/l, magnesium sulfate 8-9g/l, calcium nitrate 25-26g/
L, phosphatase 79-10g/l, nitric acid 12-13g/l, nickel nitrate 6.5-7g/l, sodium nitrite 2.5-3g/l, tartaric acid 5-5.5g/l are molten
Agent is water.
5. the processing method on high-intensity fasteners surface according to claim 1, which is characterized in that the chromate is molten
Liquid is the potassium dichromate aqueous solution of 2-4 g/l.
6. the processing method on high-intensity fasteners surface according to claim 1, which is characterized in that the polytetrafluoroethylene (PTFE)
Coating is selected from the xylan1425 model of whitford company.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110815057A (en) * | 2019-11-05 | 2020-02-21 | 昆山亚比斯环保包装材料有限公司 | Treatment method of acid-free phosphatized metal plate |
| CN111304574A (en) * | 2020-03-27 | 2020-06-19 | 句容市茅山交通工程镀锌材料有限公司 | Steel surface galvanizing rust-proof treatment process |
| CN112126958A (en) * | 2020-09-17 | 2020-12-25 | 苏州汇铭源工业零部件有限公司 | Method for treating surface of high-strength fastener |
| CN113846318A (en) * | 2021-09-16 | 2021-12-28 | 一汽解放汽车有限公司 | Venturi tube surface treatment method |
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| CN113846318A (en) * | 2021-09-16 | 2021-12-28 | 一汽解放汽车有限公司 | Venturi tube surface treatment method |
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