Effects of Zn(OH)₂ on Corrosion Behavior of Hot Dipped Zn Coating in Freshwater

Abstract:

The corrosion behavior of hot dipped Zn coating in freshwater with and without Zn(OH)₂ was investigated through weight loss test, polarization curve and impedance spectroscopy. The morphology of the corroded hot dipped Zn coating was analyzed by SEM, meanwhile, the effect of Cl^- on corrosion behavior of hot dipped Zn coating in saturated Zn(OH)₂ solution was examined using polarization curve. It was found that corrosion product Zn(OH)2 accelerate the corrosion of coating, Cl- promoted dissolution of anodic coating and incr_{Subscript text}eased the conductance of the solution, and the worst corrosion resistance of coating is Cl^-concentration of 1%.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 152-155
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.152
• Online since: November 2011
• Authors: Hu Yuan Sun, Bei Ni Zang, Shuan Liu, Li Juan Sun, Hui Ji Fan
• Keywords: Electrochemical Methods, Hot Dipped Zn Coating, Weight Loss, Zn(OH)₂

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