热带海洋大气环境冷轧钢板锈蚀规律

Corrosion law of cold rolled steel plate in tropical ocean atmospheric environment

海洋大气环境中影响冷轧钢板锈蚀的主要因素为温度、相对湿度和Cl^-浓度。为了研究热带海洋大气环境下环境因素对冷轧钢板在仓库中储存起锈时间的影响,以温度、相对湿度和Cl^-浓度等环境因素为变量,在室内模拟装置进行了冷轧钢板锈蚀观测试验;同时,在钢铁厂冷轧成品库房进行了冷轧钢板挂样锈蚀观测试验。结果表明,室内模拟试验和现场试验结果一致性很好,可以通过室内模拟试验研究冷轧钢板在库房中的锈蚀特征和规律;温度为20~30℃时,冷轧钢板起锈时间与大气环境相对湿度之间呈线性关系;温度为35~45℃时,冷轧钢板起锈时间与大气环境相对湿度之间呈指数关系;冷轧钢板起锈的临界相对湿度随温度升高而降低。

Temperature,relative humidity and Cl^-content are the main factors affecting the corrosion of cold rolled steel sheets in marine atmospheric environment.In order to study the influence of environmental factors on the rusting time of cold-rolled steel sheets stored in warehouses in tropical ocean atmosphere,the corrosion observation experiments of cold-rolled steel sheets were carried out in an indoor simulation device with temperature,relative humidity and Cl^-concentration as variables.At the same time,the corrosion observation experiments of cold-rolled steel sheets were carried out in the warehouse of cold-rolled products in iron and steel works.The results show that the results of indoor simulation experiment and field experiment are in good agreement,and the corrosion characteristics and rules of cold-rolled steel plate in warehouse can be studied by indoor simulation experiment.The relationship between rusting time of cold rolled steel sheets and relative humidity of atmospheric environment is linear when the temperature is in the range of 20-30℃,and exponential when the temperature is in the range of 35-45℃.The critical relative humidity of cold-rolled steel plate decreases with the increase of temperature.