Abstract
The effects of Zn2+ concentration on the corrosion of mild steel were investigated by immersion tests and electrochemical tests in NaCl aqueous solutions. Immersion tests showed the minimum corrosion rate in the Zn2+ rich solution. The specimens immersed in the Zn2+ rich solution showed comparatively smooth surfaces as compared to specimens immersed in Zn2+ free NaCl aqueous solutions observed by scanning electron and atomic force microscopes. The Zn2+ attached to the steel surface and formed a layer, suggested from the results of X-ray photoelectron and Auger electron spectroscopy observations. The coverage of the Zn layer increased with increasing Zn2+ concentrations in the solution, thereby suppressing the corrosion rate of the steel.
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