Abstract
The chemical composition of the zinc bath can strongly influence on the hot-dip galvanized coatings. In this work, the effects of tin addition on the surface morphology, and the corrosion resistance of hot-dip galvanized steel were investigated. The corrosion behavior of steel samples galvanized with zinc and Zn-Sn alloys containing different wt% Sn was analyzed by various corrosion tests such as potentiodynamic polarization Tafel lines and electrochemical impedance spectroscopy (EIS) techniques. Salt spray test was employed in order to study the corrosion products of the specimens. Surface morphology, the composition of coating layers and nature of the corrosion products were also investigated using field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray analysis (EDX) and X-Ray diffraction (XRD) techniques, respectively. The results indicated that the addition of small amounts of Sn (0.1 wt%) to the molten zinc galvanizing bath can improve the corrosion resistance of hot-dip galvanized steel.
Highlights
IntroductionSteel has always been the most favored and widely used material because of their excellent strength, formability, the economics of production, and the ability to recycle indefinitely
Metals play an important role in our everyday life
The most popular and most widely process used for corrosion protection of steel is galvanizing [1] [2]
Summary
Steel has always been the most favored and widely used material because of their excellent strength, formability, the economics of production, and the ability to recycle indefinitely. It tends to react with agents in the atmosphere to form stable bonds—ferrous oxides and. (2016) Improvement the Corrosion Resistance for the Galvanized Steel by Adding Sn. Journal of Surface Engineered Materials and Advanced Technology, 6, 58-71. The rate of these reactions depends on the nature and concentration of the corrosive agents present in the environment. Enhancing life of galvanized products results in the reduction in maintenance and replacement costs, thereby large savings in energy. The galvanized coating provides protection to the substrate through the formation of a physical barrier, separating the corroding atmosphere from the substrate, which is more commonly known as “barrier protection”, where Zn being lower in the galvanic series than Fe, so it corrodes preferentially, protecting the substrate [3]
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