[Introduction]A self-lubricating film suitable for micro-motor applications is urgently needed for Al-Zn-Mg alloy coated steel sheets.[Method]The properties of three types of chrome-free self-lubricating products for moderate-aluminum Al-Zn-Mg alloy coated steel sheets were studied by surface micromorphology observation and elemental composition analysis of the self-lubricating films.The key performances such as corrosion resistance and wear resistance of the self-lubricating films were examined,and the reasons of the differences in their performances were discussed in consideration of the compositional characteristics and actual applications of the self-lubricating products.[Result]As compared with 1#and 2#chrome-free weak organic acid self-lubricating products,3#organic-inorganic self-lubricating product is of inorganic acid,has stronger interfacial reaction with the steel surface,and produces a film with higher adhesion strength,corrosion resistance,fingerprint resistance,electrical conductivity,and wear resistance.[Conclusion]The 3#chrome-free self-lubricating product contains phosphate,which is not only a corrosion inhibitor,but also one of the effective components of the barrier layer and bonding layer,improving the corrosion resistance of the self-lubricating film.Fluorotitanic acid,as an additive,acts not only as a corrosion inhibitor to improve the corrosion resistance of the self-lubricating film,but also as a filler filling the pores in the film,which facilitates the formation of a compact self-lubricating film,effectively reduces the friction coefficient of the film,and improves the forming performance of Al-Zn-Mg alloy coated steel sheets.
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