Self-cleaning performance of a self-cleaning pre-coated steel sheet in an industrial environment

摘要

A type of self-cleaning pre-coated steel sheet with excellent self-cleaning performance was developed using hydrophilic surface treatment technology. To understand the self-cleaning properties of this pre-coated steel sheet in an industrial environment,the Jiangjin natural environmental test station was chosen as the outdoor exposure test to be conducted,and the self-cleaning performance of the steel sheet was studied by measuring the water contact angle,stain resistance factor,color difference,and gloss of the steel sheet during the outdoor exposure test. The water contact angle of the self-cleaning steel sheet quickly decreased from 84° to 29° during the outdoor exposure test,and the steel sheet showed excellent hydrophilic properties,which were beneficial to the spread of rain drops and detrimental to the accumulation of the surface pollutants. After an outdoor exposure of12 months,the self-cleaning steel sheet had a higher stain resistance and cleaner surface than the comparison sample sheet,demonstrating its excellent self-cleaning properties. M oreover,the color difference and gloss rate of the self-cleaning steel sheet were similar to those of the pre-coated steel sheet without hydrophilic surface treatment. Therefore,the hydrophilic surface treatment technology used in this study did not affect the anti-aging property of the self-cleaning steel sheet.