Corrosion inhibitor doped protein films for protection of metallic surfaces: appraisal and extension of previous investigations by Brenner, Riddell and Seegmiller

Abstract

An evaluation of the efficacy of chromated protein coatings, originally proposed by Brenner, Riddell and Seegmiller has been undertaken. Some of their original application methods and coating solution formulations have been utilised to produce films on zinc electroplated steel surfaces. Subsequent morphological and corrosion studies have highlighted the enhanced corrosion resistance afforded by these treatments, attributed to the high level of hexavalent chromium dispersed in the coatings. Additional experiments were undertaken with molybdate, tungstate and cerium trichloride corrosion inhibitors as more environmentally friendly substitutes for the chromate. Although their performance was inferior, cerium trichloride did engender a promising level of corrosion protection to the electroplated zinc surfaces.

Keywords:

• PROTEIN COATINGS
• PASSIVATION TREATMENTS
• CONVERSION COATINGS
• CHROMATES
• MOLYBDATES
• TUNGSTATES
• CERIUM TRICHLORIDE