Electrolyte for preparing aluminum alloy hard anodic oxide film and preparation method

Abstract

The invention discloses an electrolyte for preparing an aluminum alloy hard anodic oxide film and a preparation method. The electrolyte is prepared from the following components in parts by weight: 180-200 parts of sulfuric acid, 30-50 parts of oxalic acid, 5-10 parts of an additive a, 10-15 parts of sodium acetate and 0.05-0.1 part of an additive b. The thickness of the hard oxide film prepared from the electrolyte can reach 60-100 [mu]m, the Vickers hardness number is higher than 400 VHN, the oxide film after hole-sealing with hot high-temperature pure water has a large resistance coefficient and good insulativity, the breakdown resistance voltage can reach 2 KV, the corrosion resistance can reach more than 8 hours, and meanwhile, the oxide film has high abrasion resistance and heat resistance.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to an electrolyte solution for preparing an aluminum alloy hard anodic oxidation film and a preparation method. Background technique [0002] Conventional hard anodizing usually uses sulfuric acid as the electrolytic solution. This electrolytic solution is cheap, and the composition and concentration of the bath are easy to control at ordinary times. However, as the requirements for the performance of the oxide film continue to increase, the hardness, corrosion resistance and insulation of the oxide film prepared by the conventional sulfuric acid hard anodizing process can no longer meet the needs of core components in the military industry and semi-monomer industries. [0003] The oxide film prepared by hard anodic oxidation requires high thickness and high resistance, which will directly affect the oxidation effect of current intensity in the oxidation proc...

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Problems solved by technology

Although a complete set of refrigeration system and external output voltage are also required, the conventional sulfuric acid hard anodic oxidation process requires higher external output voltage requirements in low temperature environments (-2°C to +2°C), greater energy consumption, and higher energy consumption. It is easy to burn the workpiece, and at the same time, the film formation rate is slow in low temperature environment, and the production efficiency is low, which needs to be improved