Al-Si alloy preplating bi-coordinating agent acidic zinc dipping solution and preparation method thereof

An aluminum-silicon alloy, double-coordination technology, applied in the field of inorganic metal materials, can solve the problems of corrosion of aluminum-silicon alloy matrix, inability to meet the precision requirements of parts size, and unsuitable for aluminum-silicon alloys, achieving good coverage and beneficial to the body. Healthy, low-cost effects

Inactive Publication Date: 2010-08-11
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the severe corrosion of the aluminum-silicon alloy matrix due to the alkaline zinc dipping solution, it cannot meet the precise requirements for the size of the parts, so the alkaline zinc dipping process has become increasingly unsuitable for aluminum-silicon alloys

Method used

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  • Al-Si alloy preplating bi-coordinating agent acidic zinc dipping solution and preparation method thereof
  • Al-Si alloy preplating bi-coordinating agent acidic zinc dipping solution and preparation method thereof
  • Al-Si alloy preplating bi-coordinating agent acidic zinc dipping solution and preparation method thereof

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Embodiment Construction

[0024] The following examples describe the present invention in more detail:

[0025] The configuration method of aluminum-silicon alloy pre-plating treatment double-coordinating agent acidic zinc dipping solution of the present invention is: (reagents used and distilled water are analytically pure)

[0026] Taking the following acidic zinc dipping solution as an example, it consists of 100g / L zinc chloride, 20g / L sodium citrate, 20g / L ammonium bifluoride, 25g / L boric acid, 20g / L thiourea, and 2g sodium dodecylsulfonate. / L, 30% hydrogen peroxide 0.5mL / L, activated carbon 2g / L and distilled water to prepare an acidic zinc dipping solution, and the aluminum-silicon alloy sample was zinc dipped in this solution.

[0027] 1) Get zinc chloride 100g / L and fully dissolve it with distilled water;

[0028] 2) Sodium citrate 20g / L is fully dissolved in distilled water to form a clear solution;

[0029] 3) Ammonium bifluoride 20g / L is fully dissolved in distilled water to form a clear...

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Abstract

The invention provides Al-Si alloy preplating bi-coordinating agent acidic zinc dipping solution and a preparation method thereof. The solution is characterized in that: the solution is prepared from 90 to 110g / L of zinc chloride, 10 to 30g / L of sodium citrate, 15 to 30g / L of ammonium bifluoride, 20 to 30g / L of boric acid, 15 to 20g / L of thiocarbamide, 1.5 to 2g / L of sodium dodecyl sulfate, 0.2 to 0.5 mL / L of 30 percent hydrogen peroxide, 1 to 3g / L of activated carbon and distilled water. The zinc chloride is taken as major salt, the sodium citrate and the ammonium bifluoride are taken as double coordinating agents, the boric acid is taken as a buffering agent and pH modifier, the thiocarbamide is taken as a hydrogen inhibitor, and the sodium dodecyl sulfate is taken as a wetting agent. Compared with other methods, the method of the invention has the advantages of simple process, easy control, low cost, little corrosion to a Al-Si alloy substrate, and quite good shape, evenness, density and coverage of zinc grains. The coordinating agents do not contain cyanides, which is beneficial to the environmental protection and the good health of operators, and can realize green production.

Description

technical field [0001] The invention relates to an acid zinc dipping solution for pretreatment of aluminum-silicon alloy plating, and also relates to a configuration method of acid zinc dip solution for pretreatment of aluminum silicon alloy plating. It belongs to the field of inorganic metal materials. Background technique [0002] Cast aluminum alloys, that is, aluminum alloys for castings and die castings, almost 90% are binary Al-Si alloys based on Al-Si and multi-element Al-Si systems containing a small amount of Cu, Mg, Ni and other elements. alloy. Aluminum-silicon alloy die castings, due to the specificity of their casting process and structure, make pretreatment before plating extremely difficult, and poor bonding is prone to occur after plating. There are many special pretreatment methods before aluminum-silicon alloy plating, such as galvanizing method, electroplating thin zinc layer method, anodic oxidation method, direct electroplating method, chemical nickel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/44
Inventor 黄晓梅赵发强朱俊生
Owner HARBIN ENG UNIV
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