Abstract
This is to report on the tests on anti-corrosion of pure magnesium, Mg-RE, Mg-Zn, Mg-RE-Zn, EK30, EZ33, ZK51, AZ63, AZ92, A10 and Mg-Mn alloys. Under these tests, the specimens of the above alloys were dipped into the solutions of 0.06 N HCl and 1N NaCl plus 3% H2O, and quantity of gas generated from the specimens by corrosion was measured.
It was found out that the magnesium alloys containing Zirconium have better anti-corrosion properties than ordinary Mg-Al-Zn-Mn alloys. This is due probably to the fact that magnesium is purified and the contained iron is excluded by Zirconium.
Subsequent experiments were made for finding out the anti-corrosive effects of various chemical treatments on magnesium alloys. The bath was prepared with solutions of 15% potassium dichromate, 0.5% hydrochloric acid, 5% nitric acide, which were kept under the temperature of 40°C.
It was found out from the above experiments that the Mg-RE-Zn alloy shows good corrosion resistance, while the above chemical treatments can not improveits anti-corrosion properties.
