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Magnesium alloy surface chemical cleaning process and cleaning liquid

A technology of surface chemistry and process method, applied in the field of magnesium alloy surface chemical cleaning process method and chemical cleaning liquid, can solve the problems of strong volatility, chloride ion hazard, unsatisfactory cleaning effect, etc., and achieve pollution elimination and simple and convenient treatment , The effect of facilitating the treatment of three wastes

Inactive Publication Date: 2004-12-08
杨景林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For die castings, it is often cleaned with a mixed solution containing chromic acid, hydrofluoric acid or nitric acid, ferric nitrate solution, and also with acetic acid-nitric acid solution, sulfuric acid solution, phosphoric acid solution, nitric acid solution, or other mixed acid solutions. It is often not ideal, there are more or less gray films on the surface, which affects the quality of subsequent processing
Although concentrated hydrochloric acid can be cleaned, it is highly volatile and difficult to use in industrial production, and there are also hazards of chloride ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The AZ91D alloy die-casting parts with no oil on the surface were placed in H 3 PO 4 (Industrial grade) 55%, H 2 SO 4 (Industrial grade) 25% (volume percentage) solution, at 50 ℃, soak for 15 seconds, after washing twice, in NaOH 50g / L, NaOH 3 PO 4 6g / L solution, soak for 3 minutes at room temperature, after washing with water, the surface is silvery white. Cleans refurbished parts with old chemical conversion coating, silvery white finish.

Embodiment 2

[0032] The AZ91D alloy die-casting parts with no oil on the surface were placed in H 3 PO 4 (Industrial grade) 30%, H 2 SO 4 (Industrial grade) 10% (volume percentage) solution, at 15 ℃, soak for 20 seconds, after washing twice, in NaOH 10g / L, NaOH 3 PO 4 Immerse in 10g / L solution at 50°C for 5 minutes, and after washing with water, the surface is silvery white. Cleans refurbished parts with old chemical conversion coating, silvery white finish.

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PUM

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Abstract

This invention relates to chemical cleaning process and agents for magnesium alloy. The chemical cleaning agents comprises phosphoric-sulfuric acid aqueous solution as washing agent at some ratio and alkali solution as cleaning agent. The chemical cleaning process is carried out by immersing parts without oily stain in acid solution for a fixed time, then washing them in water and immersing them in alkali solution for a fixed time, finally, washing them in water so as to remove settlings or remains due to oxidizing, eroding, mold parting agent for compression casting, chemical conversion film, etc. It can be used as pre-treatment for chemical or electrochemical protective process to provide clean surface. It processes effectively with good quality, easy operation, and stable solutions. The solutions do not contain hexavalent chromium and fluoride so as to wastes treatment, and can be used in industrial production.

Description

technical field [0001] The invention relates to a process method for chemically cleaning the surface of a magnesium alloy and a chemical cleaning liquid. In particular, it relates to the process of chemically cleaning the surface of die-casting parts such as AZ91D and the formulation of the chemical cleaning solution. Background technique [0002] Magnesium is extremely abundant on earth. The density of magnesium is only 1.78g / cm 3 , 2 / 3 of aluminum and 1 / 4 of steel. Magnesium alloys have the advantages of high strength, shock absorption, thermal conductivity, easy die-casting, and direct recycling. In addition to its application in the aerospace field, it is one of the most attractive structural materials for "lightweight" automobiles. Many countries are developing new magnesium alloys and researching die-casting technology. In cars, such as steering wheel, seat frame, gearbox parts, etc., it has a wide application prospect in computer casings and mobile phone parts. ...

Claims

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Application Information

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IPC IPC(8): C23G1/02C23G1/12
Inventor 杨景林
Owner 杨景林
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