Method for preparing titanium oxide based ceramic membrane layer on surface of light metal or alloy of light metal

Abstract

The invention discloses a method for preparing a titanium oxide based ceramic membrane layer on the surface of a light metal or an alloy of the light metal. The method comprises the following step of continuously carrying out anodic plasma discharge oxidation and electrochemical deposition combined process treatment on a workpiece made from the light metal or the alloy of the light metal or a workpiece coated with the light metal or the alloy of the light metal in an electrolytic tank, wherein electrolyte is an acidic solution which contains titanium salt and has a pH value of 1.5-5.0, the electrolyte is controlled at the temperature of 5-35 DEG C, direct current is used in an anodic plasma discharge oxidation stage, and alternating current is used in an electrochemical deposition stage, the current density is 3-10A / dm<2>, the peak voltage of electrochemical deposition is 300-600V, and the treatment time is 0.5-5 minutes. The method disclosed by the invention can be used for preparing the high-quality titanium oxide based ceramic membrane layer on the surface of the light metal or the alloy of the light metal, outstandingly enhancing the property and yield of a product and greatly improving the preparation efficiency.

Description

technical field [0001] The invention relates to metal surface treatment technology, in particular to a method for manufacturing a titanium oxide-based ceramic film layer on the surface of light metal or its alloy. Background technique [0002] Light metals such as aluminum, magnesium, titanium and their alloys have excellent properties such as low density, high specific strength, excellent electrical and thermal conductivity, corrosion resistance, good plasticity and formability, easy processing, and no low-temperature brittleness. In terms of applicability, it has become the second largest type of metal material after steel. They can be processed into various structural parts through various processes such as extrusion, forging and die-casting, and are widely used in automobiles, aviation, aerospace, ships, medical care, construction, military, communications, electronics, electrical appliances, LED lighting, etc. in almost all in the industrial field. [0003] Traditiona...

AI Technical Summary

Problems solved by technology

However, as a ceramic coating, it also has high porosity and poor toughness, and the transition layer of titanium alloy micro-arc oxidation coating has a large size, obvious interface, and poor bonding force.

[0004] Patent document CN 102634832A A method for preparing the surface coating of an aluminum alloy element and a method for preparing an arc-starting barrier layer and a heat-insulating composite ceramic coating on the surface of an aluminum alloy element described in the system. The time required for the two preparation processes is 33 minutes and 75 minutes , the efficiency is extremely low

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