CN1049873A - The surface preparation of retaining element - Google Patents
The surface preparation of retaining element Download PDFInfo
- Publication number
- CN1049873A CN1049873A CN 89106929 CN89106929A CN1049873A CN 1049873 A CN1049873 A CN 1049873A CN 89106929 CN89106929 CN 89106929 CN 89106929 A CN89106929 A CN 89106929A CN 1049873 A CN1049873 A CN 1049873A
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- Prior art keywords
- retaining element
- aluminium powder
- zinc
- weight ratio
- chromate
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Abstract
The present invention relates to a kind of surface treatment method of retaining element, it is characterized in that when retaining element finish zinc-plated and chromate treating after, coating contains the heat resisting coating of aluminium powder and baking vanish in addition on chromate film, thereby make to contain filming of aluminium powder and place on the chromate film, make retaining element that best corrosion and rust-preventing characteristic be arranged.
Description
The present invention relates to a kind of surface preparation of retaining element, mean a kind of surface treatment method that can make the retaining element surface reach the protection effect of antirust and corrosion protection really especially.
General retaining element such as screw, nut or bolt etc. need plate one deck zinc usually again to reach antirust purpose after manufacturing finishes.And, be the solidity to corrosion that prevents that zinc-plated film oxidation from producing white corrosion product (zinc subcarbonate) and promoting zinc-plated film, make the adherence that zinc-plated beyond the region of objective existence shape is attractive in appearance and promote the coating ground, almost all need carry out chromate treating on all zinc-plated thing surfaces.
The processing of chromic salt ties up to and chemically makes it deposition generation zinc chromate on the zinc-plated film (layer); Yet; this chromate film (layer) is gelationus hydrate; material is soft than metal; be easy to generate slight crack; in a single day apply other external force during use, the chromate film (layer) on retaining element surface is broken, when slight crack is shallow; the ability that reoxidizes by chromate film can be protected zinc-plated rete, yet zinc coating can not reach sufficient rust-proof effect under most situation.
In addition, the thermotolerance of chromate film and water tolerance are also not good, as efflorescence when the temperature more than 350 ℃ and be easy to come off, and when being exposed to more than 130 ℃ temperature continuously, chromate film promptly disappears to the corrosion protection power of zinc-plated film, be dipped in hot water or when under water for a long time when retaining element again, chromate film is expanded and break, thereby lose its corrosion protection effectiveness.
The contriver in view of this, for solving the defective of known chromate film, still active research is developed a kind of surface preparation of retaining element, in the hope of can reach really the protection retaining element effect, through experiment test repeatedly, succeed in developing the present invention finally.
Main purpose of the present invention is to provide a kind of surface treatment method of retaining element, by means of a kind of solidity to corrosion, thermotolerance is good and quality is tough films and the chromate film on retaining element surface is covered, thereby reaches the effect of protection retaining element.
The present invention tie up to the retaining element surface finish zinc-plated and chromate treating after, coating contains the heat resisting coating of aluminium powder and baking vanish in addition on chromate film, and is its feature to contain the surface preparation that filming of aluminium powder be covered on the chromate film.
For reaching the present invention's above-mentioned purpose, below will enumerate a preferred embodiment of the present invention, and be elaborated in conjunction with the accompanying drawings.Other characteristic of the present invention and advantage thereof also can therefrom further be found out.
Description of drawings:
Fig. 1 system carries out the partial enlarged drawing of surface-treated retaining element with method of the present invention.
Fig. 2 and Fig. 3 be respectively not with the present invention's method carry out the surface-treated retaining element with the present invention's method in addition the retaining element of surface treatment carry out enlarged view before the salt spray testing.
Fig. 4 and Fig. 5 be respectively not with the present invention's method carry out the surface-treated retaining element with the present invention's method in addition the surface-treated retaining element carry out enlarged view after the salt spray testing.
System shown in Figure 6 with the present invention's method carry out the surface-treated retaining element with not with the present invention's the method surface-treated retaining element comparative result that carries out salt tolerant acid test in addition.
System shown in Figure 7 with the present invention's method carry out the surface-treated retaining element with not with the present invention's method in addition the surface-treated retaining element carry out the comparative result of alkali resistance test.
Tie up to after retaining element 1 finishes zinc-plated film 2 and chromate film 3 and handle by the present invention shown in Figure 1; coating contains the heat resisting coating of aluminium powder and baking vanish in addition on chromate film 3 again; contain aluminium and film 4 and form; the latter covers on the chromate film 3; in the present invention; aluminiferous heat resisting coating is by aluminium powder; silicone resin (silicone); alkyd (ALKYD) resin and aromatic series kind solvent are formed; wherein the shared weight ratio of aluminium powder is best in the scope of 10%-15%; identical with zinc; aluminium also has ionization tendency; zinc is owing to it has the ferrous material that ionization tendency is used to protect retaining element 1; yet; aluminium be have ionization tendency and in order to the protection zinc; processibility the best in the metalloid of chromium and cost the lowest; therefore utilization of the present invention contains aluminium and films and 4 protect chromate film 3; in addition; containing aluminium films and 4 has characteristics tough and that thermotolerance is good; and splendid external force and the heat-stable performance of resisting; if when destroying chromate film 3 and slight crack accidentally and arrive zinc-plated film 2 because of external force; then film the ionization tendency of aluminium in 4 greater than zinc owing to contain aluminium; therefore still can protect the ferrous material of zinc-plated film 3 and following retaining element 1 thereof really, thereby guarantee the corrosion protection of the ferrous material of zinc-plated film 3 and retaining element 1; rust inhibition.
The contriver has finished following experiment, explanation thus, and the surface preparation of application the present invention's retaining element can make retaining element that advantages such as best corrosion and rust-preventing characteristic are arranged, wherein:
Test portion 1: through the tapping screw of zinc-plated (about 10 μ of thickness) and chromate treating.
Test portion 2: first after behind zinc-plated (about 10 μ of thickness) and the chromate treating, the heat resisting coating coating of forming via the listed composition of table 1 again and in addition the tapping screw behind the baking vanish (200 ℃/20), wherein about 20 μ of coating thickness.
Table 1
Aluminium powder 13%(weight ratio)
Silicone resin 3.5%(weight ratio)
Alkyd (ALKYD) resin 13.8%(weight ratio)
The fragrance flux 69.7%(of same clan weight ratio)
(1) salt spray testing: with reference to Fig. 2 to Fig. 5, wherein Fig. 2 and the enlarged view that is respectively before test portion 1 and test portion 2 carry out salt spray testing shown in Figure 3, Fig. 4 and the enlarged view that then is respectively after test portion 1 and test portion 2 carry out salt spray testing shown in Figure 5, after test portion 1 and test portion 2 being carried out 500 hours salt spray testing, by Fig. 2,3 and Fig. 4,5 comparison can obviously find out, test portion 1(sees Fig. 2 and Fig. 4) the thread main body destroyed by the brinish heavy corrosion, and test portion 2(sees Fig. 3 and Fig. 5) some corrosion of thread surface, but still the thread main body that is kept perfectly.
(2) test of salt tolerant acid corrosion: with reference to shown in Figure 6, test portion 1 and test portion 2 immersed in 5% hydrochloric acid soln after 24 hours, can find out obviously that by Fig. 6 test portion 1(sees three screws in the left side among the figure) ferrous material have significant corrosion phenomenon and whole surface all to give birth to the corrosion line of spottiness shape; Test portion 2 does not then change fully.
(3) alkali resistance test: with reference to shown in Figure 7, it is in 3% the sodium hydroxide solution after 72 hours that test portion 1 and test portion 2 immersed concentration, test portion 1(sees three screws in the left side among the figure) ferrous material do not corrode, but zinc-plated film peels off fully and exposes ferrous material, and test portion 2 only has and contains aluminium on a small quantity and film because of being subjected to the erosion variable color of alkali, and beneath zinc-plated film then still keeps original state.
From the above mentioned as can be known; the ferrous material of retaining element 1 is filmed after the 4 three-layer coated protections being subjected to zinc-plated film 1, chromate film 3 and containing aluminium; has good corrosion protection result; and the upper strata contains aluminium and films and 4 demonstrate performance tough and that thermotolerance is good; effect for external force and heat is very stable; so, method of the present invention very big friction resistance is arranged when locking and be accompanied by heating or the surface treatment of retaining elements such as the tapping screw that often exposed to wind and rain when using and drill bit screw very effective.
In sum; surface treatment method of the present invention; really can make retaining element reach anticorrosion effectively; the intended purposes of corrosion protection and effect; and do not see publication and public use before the application, so propose patent application at this in accordance with the law, the above only is the preferred embodiment of this case; the equivalence that all person skilled in the art did changes or modifies, all should be within scope of patent protection of the present invention.
Claims (3)
1, a kind of surface treatment method of retaining element, it is characterized in that when retaining element finish zinc-plated and chromate treating after, go up heat resisting coating that coating contains aluminium powder and baking vanish in addition at chromate film (layer), thereby be covered on the chromate film to contain filming of aluminium powder, make retaining element that best corrosion and rust-preventing characteristic be arranged.
2, method according to claim 1, it is characterized in that aluminiferous filming is by aluminium powder, silicone resin (silicone), alkyd (ALKYD) resin and aromatic series kind solvent are formed, and wherein the shared weight ratio of aluminium powder is preferable in 10%～15% scope.
3, method according to claim 1 is characterized in that aluminium powder accounts for the 13%(weight ratio in the aluminiferous heat resisting coating), silicone resin accounts for the 3.5%(weight ratio), alkyd (ALKYD) resin accounts for the 13.8%(weight ratio), the aromatic series kind solvent accounts for the 69.7%(weight ratio) for best.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106929 CN1049873A (en) | 1989-08-30 | 1989-08-30 | The surface preparation of retaining element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89106929 CN1049873A (en) | 1989-08-30 | 1989-08-30 | The surface preparation of retaining element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1049873A true CN1049873A (en) | 1991-03-13 |
Family
ID=4856981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89106929 Pending CN1049873A (en) | 1989-08-30 | 1989-08-30 | The surface preparation of retaining element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1049873A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100580259C (en) * | 2005-06-13 | 2010-01-13 | 株式会社佐贺铁工所 | Screw and screw fastening structure |
| CN102604585A (en) * | 2012-03-12 | 2012-07-25 | 深圳市兴时达科技产品有限公司 | Electronic protecting glue, and preparation method and application thereof |
-
1989
- 1989-08-30 CN CN 89106929 patent/CN1049873A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100580259C (en) * | 2005-06-13 | 2010-01-13 | 株式会社佐贺铁工所 | Screw and screw fastening structure |
| CN102604585A (en) * | 2012-03-12 | 2012-07-25 | 深圳市兴时达科技产品有限公司 | Electronic protecting glue, and preparation method and application thereof |
| CN102604585B (en) * | 2012-03-12 | 2013-08-21 | 深圳市兴时达科技产品有限公司 | Electronic protecting glue, and preparation method and application thereof |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |