Chemical oxidation technology of gold film of porous ZM6 magnesium alloy spare part

A chemical oxidation and magnesium alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of the influence of the dimensional accuracy of porous parts, the difference in the appearance and color of the film layer, the influence of the performance of the parts, etc. Good sex, reduce pollution effect

Inactive Publication Date: 2019-01-08
BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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AI Technical Summary

Problems solved by technology

[0003] Since the film layer obtained by the general chemical oxidation method of magnesium alloy has a certain influence on the dimensional accuracy of porous parts, the appearance color of the obtained film layer is also different, so that it will affect the performance of the part.
The standard potential of magnesium is -2.37V, which is lower than that of other metals, but magnesium alloys have poor corrosion resistance, are easy to oxidize and burn, and rust quickly in humid environments, requiring special protective measures

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of porous type ZM6 magnesium alloy part gold system thin film chemical oxidation process, comprises the following steps:

[0022] Step 1: Prepare the ZM6 magnesium alloy chemical oxidation bath, and adjust the formula of each component. The adjusted plan is:

[0023] Potassium dichromate: 80~100g / L Ammonium sulfate: 1~2g / L

[0024] Chromic anhydride: 0.5~1.5g / L Acetic acid: 6~10ml / L

[0025] Film-forming accelerator: a compound of one or more of sodium nitrate, potassium nitrate, hydrogen peroxide, and potassium permanganate, with a concentration of 5-50 g / L.

[0026] Corrosion inhibitor: a compound of one or more of sodium dihydrogen phosphate, potassium dihydrogen phosphate, disodium hydrogen phosphate, and dipotassium hydrogen phosphate, with a concentration of 1-10 g / L.

[0027] The main function of the film-forming accelerator is that it can be used to activate the magnesium alloy substrate and form a protective film at the same time, so that the surface p...

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Abstract

The invention belongs to the field of surface treatment of a magnesium alloy spare part and particularly relates to a chemical oxidation technology of a gold film of a porous ZM6 magnesium alloy sparepart. The technology comprises the following steps: step I: preparing ZM6 magnesium alloy chemical oxidation tank liquor, step II: performing chemical oxidation, and step III: detecting dimensional precision of pores before and after the chemical oxidation. According to the technology, contents of ingredients of the tank liquor are adjusted; an acid mist inhibitor preventing volatilization of acetic acid during heating is added; the gold film can be obtained by oxidizing the porous ZM6 magnesium alloy spare part with a chemical oxidation solution formula; a film layer is uniform; the obtainedgold film layer is high in repeatability during testing; the influence on pore precision is small; and the influence of the surface treatment on the dimension and appearance of the porous magnesium alloy spare part is comprehensively reduced.

Description

technical field [0001] The invention belongs to the field of surface treatment of magnesium alloy parts, and in particular relates to a chemical oxidation process for golden thin films of porous ZM6 magnesium alloy parts. Background technique [0002] Magnesium alloy is the lightest metal among all metal structural materials. It is this characteristic that makes magnesium alloy the material of choice for weight reduction. However, the corrosion resistance of magnesium alloy is very poor, which restricts its application in practical engineering. The data show that the corrosion resistance of magnesium alloys can be improved by surface treatment, and the application of magnesium alloys in actual products can be promoted. The chemical oxidation method of magnesium alloy is an effective method for the anti-corrosion treatment of the surface of magnesium alloy. By contacting the magnesium substrate with a specific solution, a layer of insoluble compound film with good adhesion is...

Claims

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Application Information

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IPC IPC(8): C23C22/33
CPCC23C22/33
Inventor 杨茗佳汤宏才崔永信
Owner BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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