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Aluminum alloy surface phosphatizing fluid and phosphatizing method

A technology of aluminum alloy surface and phosphating treatment, applied in the direction of metal material coating process, etc., to achieve the effect of easy management and control, good corrosion resistance, and fast film forming speed

Inactive Publication Date: 2010-11-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as "Electroplating Process Handbook" (the second edition of Machinery Industry Press in August, 1997); another example is Chinese patents ZL92102593.9, ZL200510013473.6, ZL200610092988.4, which mainly disclose the phosphating solution for the phosphating treatment of steel surfaces , there are few reports on phosphating treatment of aluminum alloy surface

Method used

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  • Aluminum alloy surface phosphatizing fluid and phosphatizing method
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Experimental program
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Effect test

Embodiment 1

[0034] In the present embodiment, the formula that adopts phosphating solution is (containing per liter): Zn 2+ 5.0g, PO 4 3- 20g, F - 1.5g, Ni 2+ 0.7g, 1.0g ammonium molybdate, 0.6g guanidine nitrate, 0.4g salicylic acid; the phosphating treatment solution was prepared with deionized water, and the pH value of the phosphating treatment solution was adjusted to 3.5-3.7 with 30wt.% NaOH solution.

[0035] Polish the aluminum alloy sheet with No. 1-6 metallographic sandpaper first, then put the test piece into acetone and ultrasonically clean it for 10 seconds, and rinse the surface with deionized water; then use 0.1mol / L sodium hydroxide Solution etching, after alkali etching, it should be cleaned with running water in time; then the aluminum alloy sheet should be immersed in 5g / L titanium (IV) polyphosphate surface adjustment solution for surface adjustment for 1-2min; the aluminum alloy sheet after surface adjustment should be placed Put it into the phosphating solution p...

Embodiment 2

[0038] In the present embodiment, the formula that adopts phosphating solution is (containing per liter): Zn 2+ 5.8g, PO 4 3- 24g, F - 1.5g, Ni 2+ 0.8g, 1.2g ammonium molybdate, 0.6g guanidine nitrate, 0.4g salicylic acid; the phosphating treatment solution was prepared with deionized water, and the pH value of the phosphating treatment solution was adjusted to 3.5-3.7 with 30wt.% NaOH solution.

[0039] The pretreatment process and phosphating treatment process of the aluminum alloy sheet are exactly the same as the above-mentioned embodiment 1.

[0040] The phosphating film is gray black, the film layer is uniform and dense, and the film weight is 3.56g / m 2 . The copper sulfate spot corrosion test result was 137 seconds; the adhesion of the phosphating film reached the first grade.

Embodiment 3

[0042] In the present embodiment, the formula that adopts phosphating solution is (containing per liter): Zn 2+ 6.0g, PO 4 3- 24g, F - 1.8g, Ni 2+ 0.9g, 1.2g ammonium molybdate, 0.6g guanidine nitrate, 0.4g salicylic acid; the phosphating treatment solution was prepared with deionized water, and the pH value of the phosphating treatment solution was adjusted to 3.5-3.7 with 30wt.% NaOH solution.

[0043] The pretreatment process and phosphating treatment process of the aluminum alloy sheet are exactly the same as the above-mentioned embodiment 1.

[0044] The phosphating film is gray black, the film layer is uniform and dense, and the film weight is 3.77g / m 2 . The copper sulfate spot corrosion test result is 129 seconds; the adhesion of the phosphating film reaches the first grade.

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Abstract

The invention relates to an aluminum alloy surface phosphatizing fluid and a phosphatizing method, belonging to the technical field of processing of chemical conversion coatings on metal surfaces. The method of the invention mainly comprises the following steps: (1) determining the formula of the phosphatizing fluid, wherein the formula comprises the following components and contents: 4.0-8.0g / L of Zn<2+>, 15.0-30.0g / L of PO4<3->, 1.5-1.8g / L of F<->, 0.7-0.9g / L of Ni<2+>, 1.0-1.2g / L of ammonium molybdate, 0.4-0.8g / L of guanidine nitrate and 0.2-0.6g / L of salicylic acid; preparing the phosphatizing fluid from deionized water, and regulating the pH value of the phosphatizing fluid to 3.5-3.7 by 30wt% of NaOH solution; (2) grinding and polishing an aluminum alloy sheet, removing grease by acetone, etching the aluminum alloy sheet by 0.1mol / L of sodium hydroxide solution, soaking the aluminum alloy sheet into 5g / L of surface adjustment fluid to carry out surface adjustment for 1-2min, and then, putting the aluminum alloy sheet into the phosphatizing fluid; (3) controlling the temperature of the phosphatizing fluid at about 40 DEG C, and carrying out phosphatizing reaction for 5min; and (4) cleaning the aluminum alloy sheet by deionized water, and drying the aluminum alloy sheet by hot air. The phosphatizing film formed after phosphatizing has better corrosion resistance and is uniform and compact.

Description

technical field [0001] The invention relates to a phosphating treatment solution and a phosphating method for the surface of an aluminum alloy, and belongs to the technical field of chemical conversion film treatment on the metal surface. Background technique [0002] In recent years, various countries have made remarkable achievements in the research of new aluminum materials. Various high-performance, high-strength, lightweight extruded profiles, pipes, and plates have become ideal materials in industrial production, and have replaced steel. Trends in basic materials. There are many kinds of aluminum alloys, which are divided into casting alloys and pressure processing alloys according to their uses. The former is used to produce various castings, and the latter is used to produce various processed materials (such as plates, strips, pipes, etc.). [0003] The application of aluminum materials is becoming more and more extensive, and people's requirements for aluminum mate...

Claims

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Application Information

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IPC IPC(8): C23C22/42
Inventor 钟庆东陈懿盛敏奇王超王毅周琼宇林海
Owner SHANGHAI UNIV
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