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Magnesium alloy phosphating method and pickling solution thereof

A magnesium alloy and pickling technology, which is applied in the coating process of metal materials, etc., can solve the problems of local blackening, floating dust on the surface of magnesium alloy workpieces, uneven color of phosphating film, etc.

Inactive Publication Date: 2009-06-24
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing pickling process, black and ash substances (mainly composed of aluminum and zinc) are easily produced on the surface of magnesium alloy workpieces, and the black and ash substances are not easy to be completely removed in the subsequent alkaline cleaning process, so it will lead to subsequent generation of phosphorus The color of the chemical film is uneven, the local color is black, and even the surface of the magnesium alloy workpiece has defects such as floating dust

Method used

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  • Magnesium alloy phosphating method and pickling solution thereof
  • Magnesium alloy phosphating method and pickling solution thereof
  • Magnesium alloy phosphating method and pickling solution thereof

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Embodiment Construction

[0012] The magnesium alloy phosphating method of the present invention will be further described in detail with reference to the accompanying drawings and examples.

[0013] See figure 1 , is shown as the flow chart of the magnesium alloy phosphating method of preferred embodiment of the present invention, and it comprises the following steps:

[0014] Step 10, providing a magnesium alloy workpiece;

[0015] Step 20, degreasing, using a degreasing solution to remove the oil on the surface of the magnesium alloy workpiece;

[0016] Step 30, pickling, using a pickling solution to remove oxides and release agents on the surface of the magnesium alloy workpiece;

[0017] Step 40, alkali washing, using an alkali washing solution to remove the black ash on the surface of the magnesium alloy workpiece;

[0018] Step 50, chemical formation, using a chemical formation solution to form a phosphating film on the surface of the magnesium alloy.

[0019] In step 20, the degreasing time...

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Abstract

A pickling solution is used in the process of magnesium alloy phosphatization. The pickling solution comprises citric acid and silicon-free water-soluble surface active agent, wherein, the concentration of the citric acid ranges from 5 g / L to 30 g / L in the pickling solution and the concentration of the silicon-free water-soluble surface active agent ranges from 1.5 g / L to 6 g / L in the pickling solution. The invention also provides a magnesium alloy phosphatizing method using the pickling solution. The method can avoid or reduce black ash formed on the surface of a magnesium alloy workpiece.

Description

technical field [0001] The invention relates to a magnesium alloy phosphating method and a pickling solution thereof. Background technique [0002] Magnesium alloy light materials are widely used in automobiles and electrical equipment because of their low specific gravity, high strength and suitability for recycling. However, due to the active chemical properties and poor corrosion resistance of magnesium alloys, it is generally necessary to form an anti-corrosion film on the surface of magnesium alloy workpieces before use. Focus on and small surface resistance. [0003] In the prior art, a dense phosphating film is generally formed on the surface of a magnesium alloy workpiece by phosphating to improve its corrosion resistance. An existing magnesium alloy phosphating method comprises a process step of pickling. The main function of pickling is to remove oxides on the surface of magnesium alloy workpieces and release agents sprayed during die-casting, and increase the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/12C23C22/78
CPCC23C22/78C23G1/12C23C22/18
Inventor 徐盛恩刘勇李飞翔金召
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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