Active corrosion protection coating for a ZE41 magnesium alloy created by combining PEO and sol-gel techniques

作者：Ivanou D K^*; Yasakau K A; Kallip S; Lisenkov A D; Starykevich M; Lamaka S V; Ferreira M G S; Zheludkevich M L

来源：RSC Advances, 2016, 6(15): 12553-12560.

DOI：10.1039/c5ra22639b

An active protective coating for ZE41 magnesium alloy was produced by sealing an anodic layer, loaded with 1,2,4-triazole, with a sol-gel film. An anodic oxide layer was formed using PEO in a silicate-fluoride alkaline solution. This thin (1.8 mu m) porous PEO layer was impregnated with corrosion inhibitor 1,2,4-triazole and sealed with a silica-based sol-gel film modified with titanium oxide. For the first time it was demonstrated that this relatively thin PEO-based composite coating revealed high barrier properties and provided superior protection against corrosion attack during 1 month of continuous exposure to 3% NaCl. A scanning vibrating electrode technique showed a sharp decrease (100 times) of corrosion activity in micro defects formed in the 1,2,4-triazole doped composite coating, when compared to blank samples.

• 出版日期2016