Surface treatment method of Mg alloy

A surface treatment, magnesium alloy technology, applied in the field of magnesium alloy surface treatment, can solve the problems of heavy social and land cost load, environmental pollution around users, heavy metal pollution and fluorine diffusion, etc., to achieve good adhesion, uniform surface roughness, The effect of increasing corrosion resistance

Inactive Publication Date: 2006-08-30
汪俊延 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 1. For the environment: heavy chromium metal wastewater and chromium sludge solidification are not easy to find and buried in the ground-the social and land cost load is too heavy;
[0014] 2. For the user: the heavy metal chromium remaining on the surface of the accessories is precipitated, causing serious pollution to the surrounding environment of the user
[0015] 3. In addition, in the traditional way, a chemical film containing heavy metals and phosphides grows from the surface of the test piece, which will cause heavy metal pollution, fluorine diffusion, etc., and fluorine will destroy the ozone layer and cause the greenhouse effect, etc.

Method used

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  • Surface treatment method of Mg alloy
  • Surface treatment method of Mg alloy
  • Surface treatment method of Mg alloy

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Experimental program
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Effect test

Embodiment 1

[0074] The material is subjected to [hydrofluoric acid (HF) + sulfuric acid (H 2 SO 4 )] 11 and hydrofluoric acid (HF) 13 solution treatment, observed its surface morphology by scanning electron microscope (SEM) (please refer to Figure 4 shown) is similar to the appearance of the film, so it can achieve the effect of increasing the adhesion of the coating; and the measurement of the surface roughness (please refer to Figure 5 Shown) its surface can also achieve a similar roughness to facilitate subsequent painting. Figure 5 Among them, Lt: measuring length (mm); Lc: one point per unit length (mm); in experiment No. ①, the test piece just finished die-casting was used without any treatment (as-diecast).

Embodiment 2

[0076] The magnesium alloy surface treatment method of the present invention finds through electrochemical experiment result, after [hydrofluoric acid+sulfuric acid] 11 and hydrogen hydrofluoric acid 13 solution treatment, its corrosion current can drop significantly, and corrosion current can be from about 300 microamperes / square centimeter (μA / cm 2 ) down to 10 microamps / square centimeter (μA / cm 2 ) below, such as Figure 6 and shown in Table 2. The result is similar to that of chromic acid and non-chromic acid series chemical film treatment.

[0077] Table two, the test piece that implements through specific ratio [hydrofluoric acid (HF)+sulfuric acid (H 2 SO 4 )] and comparison of corrosion current before and after treatment with hydrofluoric acid (HF) solution.

[0078]

[0079] The magnesium alloy surface treatment method of the present invention is through the analysis result of X-ray diffractometer, as Figure 7 As shown, the symbol ① in the figure indicates ...

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Abstract

This invention relates to magnesium alloy surface processing method, the procedures are that a. it is processed by the mixed solution of hydrofluoric acid and sulfuric acid. b. then it is cleaned by pure water to wash surface residual agent. c. it is processed by hydrofluoric acid. d. then it is washed by pure water to wash surface residual agent. e. it is processed by calcium carbonate water solution, so the magnesium alloy surface processing is finished. In this invention, simple etching solution is used to etch the alloy surface at room temperature to make material surface single face, and put an end of corrosion.

Description

technical field [0001] The present invention relates to a surface treatment method for magnesium alloys. The treatment result of the present invention is to remove other phases on the surface of magnesium alloys instead of forming a thin film on the surface, so no special removal procedures are required in the recovery process , has the advantages of no heavy metal pollution, no fluorine (fluorine will destroy the ozone layer and cause the greenhouse effect), and can effectively increase the corrosion resistance of magnesium alloys and facilitate the adhesion of subsequent coatings. Background technique [0002] Magnesium is abundant in nature (1.93% in the earth's crust and 0.13% in the ocean), ranking third in the commonly used structural metals after aluminum and iron, and the proportion of magnesium alloys is the highest among practical structural alloys The lightest (magnesium specific gravity 1.8, aluminum 2.7, titanium 4.5, iron 7.9, copper 8.9, zinc 7.1). Due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/02C23F1/22
Inventor 汪俊延卓锜渊李青霏
Owner 汪俊延
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