Direct composite method for coating magnesium-alloy surface with nano-titanium dioxide

Abstract

The present invention discloses a direct nano-titanium dioxide chemical composite plating process on the surface of magnesium alloy including the following steps. (1)The plating bath is prepared and has the pH adjusted to 5.0-7.5 with ammonia and hydrofluoric acid and the temperature adjusted to 75-95DEG C, TiO2 nano-powder of 3-30g / l is dispersed with ultrasonic for 30-60 minutes, then stirred in the plating bath to be suspended evenly facilitating the formation of homogeneous coat. (2)The alloy is polished with 100-1000 sand paper, degreased, dried at room temperature, washed with alkaline followed by water, washed by acid at room temperature for 1-3 minutes and rinsed with distilled water, then it is activated in activator solution for 8-15 minutes and washed by water. (3)The alloy after the above treatment is dipped into the plating bath for 50-60 minutes, cleaned with water and dried at room temperature. The plating coat in this invention has nice corrosion and wearing resistance, homogeneous thickness, strong chemical stability and smooth surfaces.

Description

technical field [0001] The invention relates to a method for direct nano-titanium dioxide chemical composite plating on the surface of a magnesium alloy. Background technique [0002] Magnesium alloy has the advantages of high specific strength and specific stiffness, good shock absorption performance and high temperature plasticity, good polishing performance, excellent thermal conductivity, electrical conductivity and magnetic shielding. In recent years, with the reduction of the production cost of magnesium alloy materials, especially people's increasing attention to resource conservation and pollution reduction, the "sustainable development" characteristic of magnesium alloy makes it widely used in automobile manufacturing, aerospace, Communication equipment, household appliances, optical instruments and computer manufacturing are widely used, with an annual growth rate of 20%, especially the lightweight, good thermal conductivity, good electromagnetic shielding performa...

AI Technical Summary

Problems solved by technology

However, due to the low standard electrode potential of magnesium (-2.36V SCE), the poor corrosion resistance has become an important factor restricting the development of magnesium alloys, especially when the magnesium alloy contains - This is especially true in the corrosive environment of ions, which has more seriously affected its development in the field of biomedicine

However, due to the high activity of magnesium alloys, there is currently no effective method for modifying the corrosion nature of magnesium alloys and their surfaces.

Images