期刊
SCIENCE CHINA-CHEMISTRY
卷 55, 期 8, 页码 1598-1607出版社
SCIENCE PRESS
DOI: 10.1007/s11426-012-4677-8
关键词
AZ91D; corrosion; conversion coating; ionic liquid; pretreatment
资金
- Australian Research Council [DP0986205]
- Australian Governments Co-operative Research Centres Scheme
- Australian Research Council [DP0986205] Funding Source: Australian Research Council
This work reveals the performance of a trihexyl(tetradecyl)phosphonium bis(trifluoromethanesulfonyl)amide ([P-6,P-6,P-6,P-14][NTf2]) ionic liquid (IL) conversion coating upon AZ91D. Such conversion coatings represent a novel avenue for chromate replacement. An optimization of coating performance was pursued by careful alloy pretreatment to generate a surface on which the coating performs best, as the AZ91 substrate is distinctly different from pure or dilute Mg alloys. The results reveal that a functional conversion coating can be achieved, retarding anodic dissolution kinetics, causing a significant decrease in corrosion rate. The coating efficacy is closely tied to the pretreatment performed, which dictates both the microstructural and electrochemical heterogeneity of the surface. The resulting coatings were found to contain Mg (x) F (x) and phosphonium cation related components, the proportions of which were dependent on the pretreatment.
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