Environmental problems in the coil coating industry have caused a trend towards non-polluting pretreatment/primer combinations. In this work some environmentally-friendly systems have been studied. Impedance spectroscopy on deformed (T bent) and damaged samples has been used as a tool to obtain a selective evaluation of the best systems. Nitro-cobalt chemical conversion, with fluo-zirconate passivation coated by an epoxy-polyurethane primer having ionic exchange active pigments, gave the best solution of the systems studied.
Study of chromate-free pretreatments and primers for the protection of galvanized steel sheets
BARBUCCI, ANTONIO;DELUCCHI, MARINA;CERISOLA, GIACOMO
1998-01-01
Abstract
Environmental problems in the coil coating industry have caused a trend towards non-polluting pretreatment/primer combinations. In this work some environmentally-friendly systems have been studied. Impedance spectroscopy on deformed (T bent) and damaged samples has been used as a tool to obtain a selective evaluation of the best systems. Nitro-cobalt chemical conversion, with fluo-zirconate passivation coated by an epoxy-polyurethane primer having ionic exchange active pigments, gave the best solution of the systems studied.
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