Anode oxidating electrolysing liquid under inhibiting arc state of magnesium alloy and process for anode oxidating

Abstract

The invention relates to magnesium alloy anodic oxidation electrolyte and anodic oxidation method under arc inhibiting state. The electrolyte is used water as solvent; and its component are 75-150g / L organic amine, 6-12g / L inorganic phosphatic and boron compounds, 1-4g / L organic carboxylate, 2-5g / L fluoride, 4-10g / L metal oxysalt. Its feature is that the magnesium alloy anodic oxidation surface do not happen spark discharge in high oxidation pressure and oxidation peak current parameter. And it has the advantages of low solution toxicity, fast film forming, safe and simple operation, and low cost. The formed anodic oxide film is smooth and compact, has high hardness, and can increase magnesium and its alloy corrosion resistance. The film can be used as magnesium alloy protective layer and other coating foundation base.

Description

Technical field:

[0001] The invention relates to an anodic oxidation electrolyte and an anodic oxidation method for a magnesium alloy material in an arc-suppressed state. technical background:

[0002] Due to its excellent physical, chemical, mechanical properties, light specific gravity, high specific strength and specific stiffness, and good thermal and electrical conductivity, magnesium alloy materials have been continuously developed in the fields of aerospace, electronics, communications, and automobile manufacturing. Especially in the past ten years, with the rapid development of the automobile industry and the electronic industry, a large number of magnesium alloy parts have been used to replace plastic or even steel parts. However, the chemical stability of magnesium is low, the standard equilibrium potential is very negative (-2.34V), and the corrosion resistance is poor, which restricts its due advantages. Therefore, enhancing the corrosion resistance of magnesium ...