金属与其所在环境介质之间发生化学或电化学作用而引起的腐蚀现象到处可见,随着大工业的发展,金属腐蚀已成为一种社会性的灾害。据一些工业发达国家统计,每年由于腐蚀造成的经济损失约占国民经济生产总值的1～4%。世界上大约每年有十分之一的金属材料 As the corrosion caused by the chemical or electrochemical interaction between the metal and the environment in which it is located can be seen everywhere, with the development of large industries, metal corrosion has become a social disaster. According to statistics from some industrialized countries, the annual economic losses due to corrosion account for about 1 to 4% of the GNP. About a tenth of the world’s metal material annually