Abstract
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.
Highlights
The zinc anticorrosion protection of steels is commonly used in different environments
In most zinc coated cases, four distinctive layers have been observed. The properties of these layers strongly depended on product parameters such as chemical compositions of zinc
Increasing the surface roughness of hot-dip galvanized coatings would results in decreasing of corrosion resistance
Summary
The zinc anticorrosion protection of steels is commonly used in different environments. In the both indoor and outdoor atmospheres, automobile and electrical home appliances the zinc protection has been used due to its excellent corrosion performance. In comparison to other typical coatings zinc layer demonstrates higher adhesion and ensures cathodic protection to the scratched steel. The mentioned properties come from the structure of coated layer. Typical structure of Zn coating is composed from η, ζ, δ and Γ phases. For analysis of the zinc-coating structure created on iron alloys the basis is the Fe-Zn phase equilibrium diagram [1, 6]
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