Study on Corrosion Resistance of Alkali-Heat Modified Magnesium Alloy Surface

Nowadays, it is still challenging to simply and efficiently prepare corrosion protection film with excellent long-term corrosion resistance on magnesium alloy. Here, using an alkali-thermal process, we developed a Mg(OH)(2)/SiO2 composite film with long-term corrosion resistance on AZ91D magnesium alloy. The prepared sample's maximum capacitance semicircle had a diameter of around 4.0 x 10(8) Omega cm(2), which was about 6 orders of magnitude higher than that of a Mg substrate. Having been immersed in 5 wt% NaCl solution for 168 h, the sample still kept its integrality, with only slight pitting marks left on the surface. The preparation process is straightforward and ecologically friendly, requiring no pretreatment samples and complicated experimental instruments, resulting in cost savings and increased efficiency.

Automated summary

A Mg(OH)(2)/SiO2 composite film with long-term corrosion resistance was prepared on AZ91D magnesium alloy using an alkali-thermal process. The prepared film showed excellent corrosion resistance, with only slight pitting marks on the surface after being immersed in 5 wt% NaCl solution for 168 hours. The preparation process is straightforward and environmentally friendly, resulting in cost savings and increased efficiency.