CN101967362B - Special sealant with electrochemical activity for resisting crevice corrosion and preparation method thereof - Google Patents
Special sealant with electrochemical activity for resisting crevice corrosion and preparation method thereof Download PDFInfo
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- CN101967362B CN101967362B CN201010500526.8A CN201010500526A CN101967362B CN 101967362 B CN101967362 B CN 101967362B CN 201010500526 A CN201010500526 A CN 201010500526A CN 101967362 B CN101967362 B CN 101967362B
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Abstract
The invention relates to a special sealant with electrochemical activity for resisting crevice corrosion which is used in the steel structure and a preparation method thereof. The sealant comprises a component A and a component B, wherein the component A contains epoxy resin E51, butyl glycidyl ether 660, benzyl glycidyl ether 692 and zinc powder; and the component B contains curing agent, conducting state polyaniline and zinc powder. By adopting the formula and method of the invention, the special sealant with electrochemical activity for resisting crevice corrosion can be prepared. The sealant can solidify at the room temperature, the minimum viscosity of the sealant at the room temperature is up to 30 seconds, the maximum bonding strength is up to 0.6 MPa and the maximum shear strength is up to 15Mpa; after a simulate sample performs the accelerated salt spray test for 1000h and stands indoors for 4000h, no corrosion damage appears in the gap regions. The sealant has low cost, simple preparation technology, good physical sealing performance and excellent capability of cathodic protection.
Description
Technical field
The invention belongs to the anti-crevice corrosion technical field of steel construction piece, be specifically related to a kind of anti-crevice corrosion Special electric chemically reactive seal gum and preparation method thereof.
Background technology
Crevice corrosion is to occur in corrosion failure phenomenon common in the steel construction piece slit.It is a kind of form of local corrosion.Metal contacts with nonmetallic phase with metal or metal, contacts with rivet, bolt, packing ring, valve seat, settling, marine life etc. such as metal, can form the slit.Crevice corrosion can occur in steel construction piece in the media such as seawater or muriate.Consequently destroy in conjunction with the integrity that meets the place, cause material property to descend.Thereby cause some priority projects, such as the military service security of the large-scale steel structure members such as bridge, dock, be subject to having a strong impact on.
The measure of control of steel construction piece crevice corrosion mainly contain following several at present:
1) appropriate design.On Design and manufacture technique, should avoid as far as possible the structure that gaps.For example, connect with welding replacement riveted joint or bolt as far as possible, adopt sequential welding to replace spot welding, and avoid hole and slit in a side of crevice corrosion medium.During design containers, should guarantee that container noresidue solution when emptying exists.The ring flange packing ring of interconnecting piece will adopt non-water-absorbing material (such as tetrafluoroethylene etc.);
2) choose reasonable corrosion resistant material.Selecting suitable slit and corrosion resistant material is one of effective ways of control crevice corrosion.For example, contain Cr, Mo, Ni, stainless steel and nickel-base alloy that the N amount is higher, titanium or titanium alloy, some copper alloy etc. has preferably anti-crevice corrosion behavior.Should consider corrosion resisting property during selection, be also noted that simultaneously economic factors.For example, the Ti-Pd alloy has the excellent dense chloride media crevice corrosion behavior of heat resistanceheat resistant, but is difficult to promote the use of because it is expensive, and titanium alloy surface oozes Pd and then can address this problem.
3) take the electro-chemical protection measure.For example, to passivation metallic substance such as stainless steels, its current potential is reduced to below the protection potential, and is higher than the Flade potential region, so both guaranteed not produce spot corrosion, also do not cause crevice corrosion.
Also do not use the method that the electrochemical activity seal gum carries out sealing protection in the crevice corrosion measure of control of steel construction piece at present.The seal gum of at present general physical shielding function such as Resins, epoxy etc. also only can play the effect of physical seal to the gap structure on the steel construction piece, more crisp after the curing, antifatigue, shearing and bending property are relatively poor, and cohesive strength is not high.The seal gum of this physical shielding function is general mobile relatively poor, and curing performance is not good, can not well fill the gap structure of steel construction piece; And the seal gum weathering resistance of this physical shielding function is poor, and easily cracking peels off, and waits all failure phenomenons.More seriously, in case the inefficacy of this physical seal safeguard procedures can cause accelerated corrosion, make some priority projects, such as the military service security of the large-scale steel structure members such as bridge, dock, be subject to having a strong impact on.
Consider factor economically, and at present general seal gum such as Resins, epoxy etc. are to the shortcoming of the crevice corrosion aspect on the steel construction piece, we are by redesigning and screen general seal gum, some high performance novel materials have been added, selected suitable preparation technology, prepared a kind of anti-crevice corrosion Special electric chemically reactive seal gum, and the sample of the simulation crevice corrosion of implementing this seal gum carried out long salt fog accelerated test, determine thus best composition and engineering, obtained satisfying well the electrochemical activity protection against corrosion seal gum of the anti-crevice corrosion requirement of steel construction piece.
Summary of the invention
For addressing the above problem, the object of the present invention is to provide a kind of can be settable cementitious at normal temperatures, and technique simple possible, with low cost, anti-crevice corrosion Special electric chemically reactive seal gum that the mechanical property after the curing and corrosion protection are good and preparation method thereof.
Principle of design of the present invention is in order to guarantee the overall performance of seal gum, as antifatigue, shearing and bending property, cohesive strength, corrosion resistance nature etc. after the flowability before solidifying and filling capacity, the curing, and can ambient cure, considers simultaneously cost factor.
Technical scheme of the present invention is, a kind of anti-crevice corrosion Special electric chemically reactive seal gum, and sealing glue main component is A component and B component;
The principal constituent of described A component: Resins, epoxy E51 mass percent is 6～9%
Epoxy propane butyl ether 660 mass percents are 1%
Benzyl glycidyl ether 692 mass percents are 1%
Zn opaque amount per-cent is 89～92%;
The principal constituent of described B component: the solidifying agent mass percent is 9～12%
Zn opaque amount per-cent is 80～83%
The conductive polyaniline mass percent is 8%.
Further, the nominal particle size scope of described Zn powder is 800～2000 orders, and the particle size range of described conductive polyaniline is 20～40 μ m.
Further, described solidifying agent is cashew nut shell oil, and the amine value is at 330～350mgKOH/g.
Another object of the present invention is to provide the preparation method of above-mentioned anti-crevice corrosion Special electric chemically reactive seal gum, specifically may further comprise the steps:
1. prepare the A component: take by weighing respectively in proportion Resins, epoxy E51, epoxy propane butyl ether 660 and benzyl glycidyl ether 692 and mix, mechanical stirring 15～20 minutes, to be mixedly slowly add zinc powder after fully, the limit is stirred just and is added, mechanical stirring 20～30 minutes, until zinc powder all becomes pasty state, obtain component A;
2. preparation A component: take by weighing respectively in proportion solidifying agent and conductive polyaniline and mix, mechanical stirring 15～20 minutes to be mixedly slowly adds zinc powder after fully, the limit is stirred just and is added, mechanical stirring 20～30 minutes until zinc powder all becomes pasty state, obtains B component;
3. mix mechanical stirring with obtaining 2 parts of A components in the above-mentioned steps with 1 part of B component
20～30 minutes, namely obtain this anti-crevice corrosion Special electric chemically reactive seal gum.
The invention has the advantages that:
1) anti-crevice corrosion Special electric chemically reactive seal gum of the present invention has good chemical property, has galvanic protection and physical seal double effects.A component and B component have lower viscosity and higher flowability after mixing, and can effectively fill up the gap structure of easy generation crevice corrosion.Seal gum after the curing also has certain toughness, antifatigue, counter-bending, anti-shearing characteristic.
2) popularization of anti-crevice corrosion Special electric chemically reactive seal gum of the present invention can reduce the operation that the steel construction piece anticorrosion engineering is constructed, and shortens the engineering time, significantly reduces simultaneously the cost of anticorrosion engineering.
Embodiment
Below in conjunction with embodiment technical solution of the present invention is described further.
Embodiment 1
1 test materials: 12 Q235 cold-reduced sheets are shaped as 2mm * 45mm * 90mm.
The preparation of 2 seal gums: take by weighing E51 Resins, epoxy 12g, 660 epoxy propane butyl ether 2g, 692 benzyl glycidyl ether 2g mix, mechanical stirring 15 minutes, be that 800 purpose Zn powder 178g slowly add with size range, mechanical stirring is after 20 minutes, the A component 200g that obtains preparing; Taking by weighing the amine value mixes at the conductive polyaniline 8g that cashew nut shell oil solidifying agent 9g and the particle size range of 330mgKOH/g is 20 μ m, mechanical stirring 15 minutes, be that 800 purpose Zn powder 83g slowly add with size range, mechanical stirring is after 20 minutes, the B component 100g that obtains preparing.
3 samples for the preparation of the simulation crevice corrosion: first 2 cold-reduced sheets are sticked together, the 30mm of lower length closely snarls with wide adhesive plaster, then the top angle of breaking 30 ° into two with one's hands, the sample that to make a side be the Y type, then both sides with other two parallel covering of cold-reduced sheet, closely snarl with wide adhesive tape is whole again, above opening, form wedge shape simulation steel construction piece slit.Altogether need to prepare 3 such samples.
4 implement anti-crevice corrosion:
1) two components that make in the step 2 are mixed, fully stirring pours into and makes sample in the step 3, is full of 1/3rd and gets final product.
2) solidify: the sample after can is good is vertically placed 24h.
5 seal gum chemical properties detect: this seal gum is different from general seal gum, and it also has the function of galvanic protection.Therefore its some key property detected results are as follows:
1) test is placed at the moist place of room temperature: place 5000h at indoor moist place, find still close adhesion of position, slit, occur without any corrosion phenomenon of corrosion; And other does not implement the position of this anti-crevice corrosion Special electric chemically reactive seal gum, has then produced some rusty stains.In addition, repeatedly knock with pliability test after after sample, find cracking.Show that more than kind of anti-crevice corrosion Special electric chemically reactive seal gum has good slit and corrosion resistant performance and mechanical property at the moist place of room temperature.
2) salt fog accelerated corrosion test: after the 1000h salt fog accelerated test, find to remove still close adhesion of position, slit, outside any corrosion phenomenon generation of corrosion, other position of not implementing this anti-crevice corrosion Special electric chemically reactive seal gum is then corroded fully.In addition, repeatedly knock with pliability test after after sample, find cracking.Show that more than this anti-crevice corrosion Special electric chemically reactive seal gum has good salt spray resistance and accelerates crevice corrosion behavior and mechanical property.
3) indoor placement after the salt fog accelerated corrosion test: after the 1000h salt fog accelerated test, place 4000h at room temperature half sunlight place, find to remove still close adhesion of position, slit, occur without any corrosion phenomenon of corrosion, other does not implement the position of this anti-crevice corrosion Special electric chemically reactive seal gum, then keeps the erosion profile behind the salt spray corrosion test.Show that more than this anti-crevice corrosion Special electric chemically reactive seal gum has good galvanic protection performance.
6 sealing traditional performances detect:
Embodiment 2
1 test materials: with embodiment 1.
The preparation of 2 seal gums: take by weighing E51 Resins, epoxy 15g, 660 epoxy propane butyl ether 2g, 692 benzyl glycidyl ether 2g mix, mechanical stirring 18 minutes, be that 900 purpose Zn powder 180g slowly add with size range, mechanical stirring is after 25 minutes, the A component 200g that obtains preparing; Taking by weighing the amine value mixes at the conductive polyaniline 8g that cashew nut shell oil solidifying agent 11g and the particle size range of 340mgKOH/g is 30 μ m, mechanical stirring 20 minutes, be that 900 purpose Zn powder 82g slowly add with size range, mechanical stirring is after 30 minutes, the B component 100g that obtains preparing.
3～6 methods and result are with embodiment 1.
Embodiment 3
1 test materials: with embodiment 1.
The preparation of 2 seal gums: take by weighing E51 Resins, epoxy 18g, 660 epoxy propane butyl ether 2g, 692 benzyl glycidyl ether 2g mix, mechanical stirring 20 minutes, be that 1000 purpose Zn powder 184g slowly add with size range, mechanical stirring is after 25 minutes, the A component 200g that obtains preparing; Taking by weighing the amine value mixes at the conductive polyaniline 8g that cashew nut shell oil solidifying agent 12g and the particle size range of 340mgKOH/g is 40 μ m, mechanical stirring 20 minutes, be that 1000 purpose Zn powder 80g slowly add with size range, mechanical stirring is after 30 minutes, the B component 100g that obtains preparing.
3～6 methods and result are with embodiment 1.
Claims (4)
1. an anti-crevice corrosion Special electric chemically reactive seal gum is characterized in that sealing
The glue main component is 2 parts of A components and 1 part of B component;
The principal constituent of described A component: Resins, epoxy E51 mass percent is 6～9%
Epoxy propane butyl ether 660 mass percents are 1%
Benzyl glycidyl ether 692 mass percents are 1%
Zn opaque amount per-cent is 89～92%;
The principal constituent of described B component: the solidifying agent mass percent is 9～12%
Zn opaque amount per-cent is 80～83%
The conductive polyaniline mass percent is 8%.
2. anti-crevice corrosion Special electric chemically reactive seal gum according to claim 1 is characterized in that, the nominal particle size scope of described Zn powder is 800～2000 orders, and the particle size range of described conductive polyaniline is 20～40 μ m.
3. anti-crevice corrosion Special electric chemically reactive seal gum according to claim 1 is characterized in that, described solidifying agent is cashew nut shell oil, and the amine value is at 330～350mgKOH/g.
4. the preparation method of anti-crevice corrosion Special electric chemically reactive seal gum according to claim 1 is characterized in that, specifically may further comprise the steps:
1. prepare the A component: after taking by weighing respectively in proportion Resins, epoxy E51, epoxy propane butyl ether 660 and benzyl glycidyl ether 692 mixing, mechanical stirring 15～20 minutes, to be mixedly slowly add zinc powder after fully, add while stirring, mechanical stirring 20～30 minutes, until zinc powder all becomes pasty state, obtain component A;
2. preparation B component: after taking by weighing respectively in proportion solidifying agent and polyaniline and mixing, mechanical stirring 15～20 minutes to be mixedly slowly adds zinc powder after fully, adds while stirring, and mechanical stirring 20～30 minutes until zinc powder all becomes pasty state, obtains B component;
3. mix with 1 part of B component obtaining 2 parts of A components in the above-mentioned steps, mechanical stirring 20～30 minutes namely obtains anti-crevice corrosion Special electric chemically reactive seal gum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010500526.8A CN101967362B (en) | 2010-09-30 | 2010-09-30 | Special sealant with electrochemical activity for resisting crevice corrosion and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010500526.8A CN101967362B (en) | 2010-09-30 | 2010-09-30 | Special sealant with electrochemical activity for resisting crevice corrosion and preparation method thereof |
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| Publication Number | Publication Date |
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| CN101967362A CN101967362A (en) | 2011-02-09 |
| CN101967362B true CN101967362B (en) | 2013-02-06 |
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| CN201010500526.8A Expired - Fee Related CN101967362B (en) | 2010-09-30 | 2010-09-30 | Special sealant with electrochemical activity for resisting crevice corrosion and preparation method thereof |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102352520A (en) * | 2011-09-21 | 2012-02-15 | 湖南万容科技有限公司 | Ion exchange membrane frame |
| CN106281164A (en) * | 2016-08-26 | 2017-01-04 | 王泽陆 | A kind of heat-resistant fireproof electron pouring sealant and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308660A (en) * | 1998-06-09 | 2001-08-15 | 吉奥泰克化学公司 | Method for applying a coating that acts as an electroltolytic barrier and a cathodic corrosion prevention system |
| US6440332B1 (en) * | 1998-06-09 | 2002-08-27 | Geotech Chemical Company | Method for applying a coating that acts as an electrolytic barrier and a cathodic corrosion prevention system |
| CN101643607A (en) * | 2008-08-06 | 2010-02-10 | 中国科学院金属研究所 | Polyaniline modified metal-ceramic nano coating and preparation method thereof |
-
2010
- 2010-09-30 CN CN201010500526.8A patent/CN101967362B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308660A (en) * | 1998-06-09 | 2001-08-15 | 吉奥泰克化学公司 | Method for applying a coating that acts as an electroltolytic barrier and a cathodic corrosion prevention system |
| US6440332B1 (en) * | 1998-06-09 | 2002-08-27 | Geotech Chemical Company | Method for applying a coating that acts as an electrolytic barrier and a cathodic corrosion prevention system |
| CN101643607A (en) * | 2008-08-06 | 2010-02-10 | 中国科学院金属研究所 | Polyaniline modified metal-ceramic nano coating and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 姜海等.导电聚苯胺防腐密封胶试验研究.《科技风》.2008,全文. |
| 导电聚苯胺防腐密封胶试验研究;姜海等;《科技风》;20080430;60-61页 * |
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