【摘要】 尝试在A3钢表面施镀镍+铅双镀层,以提高其在硫酸溶液中的耐蚀性能。利用腐蚀失重方法分别测定了镀铅层与镀镍+铅双镀层的A3钢在硫酸中的腐蚀速率,并借助扫描电镜对双镀层的形态进行了观察与分析。试验表明:施镀镍+铅双镀层能明显提高A3钢的耐蚀性能。认为:镍层遮盖了A3钢表面,使阳极电位提高,腐蚀驱动力减小;铅在硫酸中析氢超电压大,且容易生成致密的硫酸铅膜,这些因素是材料耐蚀性得到明显提高的重要原因。更多还原

【Abstract】 Ni+Pb coatings are electrodeposited on the surface of A₃ steel in order to decrease the corrosion of A₃ steel in sulfuric acid solution with different concentration.The corrosion rate of A₃ steel with Pb or Ni+Pb coating is carried out by weight loss method.The morphology of Ni+Pb coatings are observed and analyzed with scanning electron microscopy.Experiment results show that the two coatings on A₃ steel will markedly increase A₃ steel anticorrosion,which will owe to the important factors such as the protection effect of coated Ni on the surface of A₃ steel,high hydrogen over-voltage on lead coating and compact lead sulfate film.The anticorrosion mechanics of the two coatings in sulfuric acid solution are discussed.更多还原