Wettability of emulsions on metal surfaces for strip cold rolling

Orthogonal test was designed and emulsion volume fraction on the wettability to investigate the efect of emulsifier mass fraction, oiliness additives of emulsions for strip cold rolling. The influence mechanism of complex emulsifiers with different anionic-to-nonionic ratios on the wettability of emulsions was also discussed in detail. It is found that the ranking of effect on the contact angle and spreading coefficient of emulsions is emulsion volume 〉 emulsifier mass fraction 〉 oiliness additives. Compared with the single nonioaic or anionic emulsifier, the complex emulsifiers present a more excellent ability of enhancing the wettability of emulsions. The surface tension of Q235 steel substrates and the emulsion-substrate interfacial tension were calculated by the Y-G-G empirical equation. The results show that surface tension of Q235 steel substrates is 43 mN·m^-1. In comparison with the single anionic emulsifier, when the mass fraction of the anionic emulsifier is 50%, the emulsion-substrate interracial tension is the lowest, which is decreased by 10.78%.