The relationship between surface treatments and corrosion resistance of hot-dip galvanized steel

Metallurgical & Materials Engineering

关键词: Hot-dip galvanized coatings;    Surface treatments;    Roughness;    Corrosion resistance;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this work three surface treatments such as: polishing, sand-blast and polishedoxidized have been carried out on the hot-dip galvanized coatings. The roughness and corrosion resistance of coatings have been studied. Surface morphology of coatings has evaluated by scanning electron microscope (SEM). Corrosion behavior was analyzed by salt spray cabinet test and Tafel extrapolation test. The results showed that the sample under sand-blasted treatment exhibited the highest roughness number. Tafel polarization and salt spray cabinet tests reveal the sample with great roughness number have weak corrosion resistance. Difference observed in corrosion behaviour can be explained by difference in surface roughness.

【 授权许可】

Unknown