The effect of Zinc, Tin, and Lead coating on corrosion protective effectiveness of steel reinforcement in concrete

Abstract

The research was aimed at developing new reinforcement materials by using of different coating materials, included zinc, tin and lead. The experimental works included examination of coating defect, coating Adhesion study, and the adhesion between concrete and coated bars, and different techniques are employed to assess the performance of the reinforcement embedded in concrete at a saline environment of 3.5% NaCl solution. These include; Accelerated Corrosion Test ASTM G 109, Half Cell Potential Test ASTM C876, electrochemical polarization by Linear and Tafel polarization techniques, microstructure, and visual inspection. Some improvement to the ASTM G109 standard test method were suggested and led to get more useful results in a shorter period. The trend of the corrosion rate results of the all specimens (worst-to-best) can be arranged as follows: Galvanized CRS › untreated CRS› tin coated CRS › lead coated CRS › SST316