A kind of electrolytic solution and the method for preparing the black film layer on the surface of magnesium alloy by using the electrolytic solution

Abstract

The invention discloses an electrolyte and a method for preparing a black membrane on an aluminum alloy surface by using same. The electrolyte comprises 8-15 g / L of hydroxide, 10-15 g / L of fluoride, 20-30 g / L of phosphate, 4-14 g / L of ferrate, 1-5 g / L of fluorotitanate, 10-20 g / L of organic alcohol and 80-300 g / L of an ablation inhibitor, and the solvent is deionized water. The method has the advantages that higher black level can be achieved on a thinner membrane to effectively avoid the problem of the discarding of a complicated precision product caused by local ablation when the complicatedprecision product is processed.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy treatment methods, and relates to an electrolytic solution and a method for preparing a black film on the surface of a magnesium alloy with the electrolytic solution. Background technique [0002] Magnesium alloy has a series of unique advantages such as low density, high specific strength / rigidity, high damping, good thermal conductivity and electromagnetic shielding, and magnesium alloy products are easy to recycle and reuse, and have no pollution to the environment. It is called "21 "Century Green Engineering Materials" have been widely used in aerospace, national defense, automobile, 3C products and other fields. [0003] Magnesium alloy micro-arc oxidation technology is a new surface treatment technology that interacts between the magnesium alloy substrate and the solution under the action of an electric field, thereby growing a ceramic film mainly composed of magnesium oxide on the s...

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Problems solved by technology

For example, the Chinese patent "Magnesium Alloy Micro-arc Oxidation Electrolyte and the Process of Using the Electrolyte to Treat Black Ceramic on the Surface of Magnesium Alloy" (Application No. 201310439874.2), and the Chinese Patent "Treatment of Black Hard Micro-arc Oxidation Ceramic Film on the Surface of Magnesium Alloy" Method "" (application number 201010530357.2), the above-mentioned patents all use copper salts because of their coloring salts. During mass production, copper salts are precipitated on the cathode, which leads to the reduction of coloring ions in the solution, resulting in poor stability of the solution. The obtained film layer consistency is poor

"Electrolyte and method for preparing black ceramic film by micro-arc oxidation of magnesium alloy" (application number 201510510427.0), "A process for preparing black ceramic film with high light absorption rate by micro-arc oxidation on the surface of magnesium alloy" (application number 201310649416.1), " Magnesium alloy micro-arc oxidation low energy consumption black ceramic film and its preparation method" (application number 201210476200.5) and other patents, the coloring salts are all made of vanadium salt, which has the problem of heavy metal pollution

In addition, magnesium alloy gold is active and has flammable properties. When using existing technologies to process products with complex and precise structures, local ablation such as threaded holes, blind cavities and corners is very easy to occur, resulting in product scrapping.

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