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Method for anti-corrosive surface treatment of aluminum or aluminum alloy product
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A processing method and technology of aluminum alloy, applied in the field of surface treatment of aluminum or aluminum alloy products, can solve the problems of leakage spraying, complex structure, restrict the promotion and application of aluminum or aluminum alloy products, etc. Effects of Corrosive Properties
Inactive Publication Date: 2012-07-04
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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Moreover, due to the complex structure of the bends and corners of aluminum and aluminum alloy products, when the aluminum and aluminum alloy products are subsequently sprayed, the phenomenon of missing spraying will occur in the parts with complex structures such as bends and corners of the products. The above defects Greatly limit the promotion and application of aluminum or aluminum alloy products
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Embodiment 1
[0048] The products used in Example 1 are aluminum or aluminum alloy lamps, and the surface anti-corrosion treatment method includes the following steps:
[0049] S1. Degreasing: Put the aluminum or aluminum alloy lamps into acetone solution to degrease the surface of the lamps;
[0050] S2. Wash and dry the degreasing lamp under pure water at 25-40℃;
[0051] S3. Phosphating treatment: Put the lamp in lye and soak for 10-30min at a temperature of 80-90℃, the lye contains: NaOH 50g / L, Na 2 CO 3 25g / L, Na 3 PO 4 ·12H 2 O 60g / L, Na 2 SiO 3 10g / L;
[0052] S4. Washing: first wash with 30℃ warm water for 2 minutes, then wash with cold water for 2 minutes;
[0053] S5. Acidizing treatment: Put the lamp in 50% HCl and 10% H 2 SO 4 Acidification treatment in the mixed solution, temperature: room temperature, etching time: 2 min.
[0054] S6. Rinse with 30℃ pure water for 2 minutes and dry;
[0055] S7. Soak the dried lamps in acetone solvent for 1 to 3 minutes;
[0056] S8. Connect the lamp to th...
Embodiment 2
[0066] The anti-corrosion treatment method for the surface of aluminum or aluminum alloy products in Example 2 is similar to that in Example 1. The difference from Example 1 is that the S11 electroless Ni-P plating step in Example 2 is: Electroless immersion plating is carried out in a nickel solution, and the composition of the medium phosphorus electroless nickel plating solution:
[0067] NiSO 4 ·6H 2 O 20~30g / L;
[0068] NaH 2 PO 2 ·H 2 O 25~35g / L;
[0069] Sodium acetate 17~25g / L;
[0070] Sodium glycolate 25~35g / L;
[0071] Stabilizer Pb 2+ 1.8~2.2ml / L;
[0072] pH value: 4.5~5;
[0073] Temperature: 90±4℃;
[0074] Time: 3h.
[0075] Through the steps of Example 2 above, a nickel-phosphorus coating is formed on the surface of aluminum or aluminum alloy lamps. The quality of the nickel-phosphorus coating: good gloss, uniformity and compactness, good bonding force, and the phosphorus content of the coating is 6-8wt%, and the hardness is In the range of 590 to 650HV, it is res...
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Abstract
The invention relates to a method for anti-corrosive surface treatment of an aluminum or aluminum alloy product, comprising the following steps of: pretreatment: carrying out pretreatment on the surface of the aluminum or aluminum alloy product; and chemical nickel and phosphorus plating: carrying out chemical nickel and phosphorus plating on the aluminum or aluminum alloy product subjected to the pretreatment in a chemical nickel and phosphorus plating solution, wherein the chemical nickel and phosphorus plating solution contains 20-30g / L of nickel salt, 20-35g / L of reducing agent and 35-60g / L of assistant. With the method for the anti-corrosive surface treatment of the aluminum or aluminum alloy product, provided by the invention, a uniform chemical nickel and phosphorus (Ni-P) plating anti-corrosion layer with favorable acid, alkali and salt resistance is formed on the outer surface of the aluminum or aluminum alloy product, thus the corrosion resistance of the surface of the aluminum or aluminum alloy product can be remarkably enhanced.
Description
Technical field [0001] The invention relates to the field of surface treatment of aluminum or aluminum alloy products, and more specifically, to a method for treating corrosion on the surface of aluminum or aluminum alloy products. Background technique [0002] Aluminum and aluminum alloys have become more and more widely used in various industries due to their low density, high strength and rigidity, good thermal conductivity, excellent castability and good processing performance, as well as good damping properties. According to statistics, in recent years, the annual growth rate of aluminum and aluminum alloy consumption has reached 25% worldwide, showing an excellent application prospect. However, aluminum and aluminum alloys have poor corrosion resistance, which has been a major factor hindering their further development and use. Especially in humid atmosphere, fresh water, sea water, most organic acids and their salts, inorganic acids and their salts, aluminum and aluminum ...
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