Preparing method of aluminum alloy surface colorful ceramic film

Abstract

The invention particularly relates to a method for preparing an aluminum alloy surface colorful ceramic film through a micro-arc oxidation method, and belongs to the technical field of surface treatment. The method comprises the steps that firstly, dirt removing and oil removing treatment is carried out on the surface of an aluminum alloy base body, cleaning is thorough, and drying is carried out; secondly, an electrolyte containing NaH2PO4, NaF, NH4F, Na2B4O7 and a coloring agent is prepared; and thirdly, the aluminum alloy base body in the first step serves as an anode, the electrolyte prepared in the second step serves as the electrolyte, a corresponding cathode is arranged, the micro-arc oxidation reaction is conducted under the voltage of 125-155 V, and when it is monitored that the current is smaller than 0.5 A, the reaction is over, and the aluminum alloy surface colorful ceramic film is obtained. The method is simple in technology, the later paint spraying treatment technology is omitted, efficiency is high, and cost is low.

Description

technical field

[0001] The invention relates to a method for preparing a colored ceramic film on the surface of an aluminum alloy, in particular to a micro-arc oxidation method for preparing a colored ceramic film on the surface of an aluminum alloy, and belongs to the technical field of surface treatment. Background technique

[0002] Applying ceramic coating on the surface of metals and alloys can replace precious metals and alloys with cheap metal materials on the premise of ensuring the performance of the original metal materials. The scope of application, and the use of machinable materials as the substrate for surface ceramic treatment can improve the machinability of ceramic materials. Among many kinds of metals and alloys, the research of surface ceramic coating with aluminum and aluminum alloys as substrates has become a hot spot, because of its wide source, high specific strength, good plasticity, good formability, low density, Good thermal and electrical conducti...