Properties of 780 MPa dual-phase steels with different compositions after silanization and electrocoating
[Introduction]There are few reports on the post-silanization coatability of high-strength dual-phase steels for automotive applications.[Method]Three series of dual-phase steel with a strength of 780 MPa i.e.C-Si-Mn,C-Mn-Cr,and C-Mn-Cr-Al series were selected for the same silanization and electrocoating processes,and the quality of the silane film and the electrocoated paint was evaluated by neutral salt spray test,stone-chip impact test,and cyclic salt spray test.[Result]The coatability of C-Si-Mn series duel-phase steel is the worst due to the fact that corrosion occurs on the surface of silane film,and the adhesion and corrosion resistance of electrocoated paint are poor,which cannot meet the requirement of general automobile manufacturers.The performance indexes of the silanized and electrocoated C-Mn-Cr series dual-phase steel can meet the requirements,except the resistance to stone-chip impact plus cyclic salt spray corrosion.The C-Mn-Cr-Al series dual-phase steel has the best comprehensive performance because all the properties of silane film and electrocoated paint on it meet the requirements of general automobile manufacturers.[Conclusion]When applying a 780 MPa dual-phase steel to the manufacturing of automobiles,the proper selection of its composition according to the application environment is recommended.
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