两种钢在高温环烷酸中腐蚀行为的研究

Study on Corrosion Behaviors of Two Kinds of Steel in High Temperature Naphthenic Acid

采用高温高压反应釜,考察温度、酸值和转速对20#碳钢、304不锈钢腐蚀速率的影响。结果表明：在220～300℃随着温度的升高,20#碳钢腐蚀速率先增大后减小,在280℃达到最大值0.654 mm/a,304不锈钢材料腐蚀速率逐渐较小;随着酸值的增大,20#碳钢腐蚀速率不断上升,在酸值为8～10 mg KOH/g时增速最大,304不锈钢呈直线趋势逐渐减小;在转速为0.8～2 m/s的范围内,20#碳钢腐蚀速率由0.654 mm/a变化到0.56 mm/a,304不锈钢由0.039 6 mm/a变化到0.011 2 mm/a,说明在低转速范围内环烷酸腐蚀影响并不太明显。

Using high temperature and high pressure reaction kettle, influence of temperature, acid value and rotating speed on 20# carbon steel and SS304 stainless steel corrosion rates was investigated. The results show that： with the increase of temperature, 20# carbon steel corrosion rate first increases and then decreases, the maximum value is 0.654 mm/a at 280 ℃, and SS304 stainless steel corrosion rate decreases gradually; with the increase of acid value, 20#carbon steel corrosion rate rises,the largest growth appears in the value of 8～10 mg KOH/g, and SS304 stainless steel corrosion rate decreases gradually; when rotation rate is in the range of 0.8～2 m/s, 20# carbon steel corrosion rate changes from 0.654 mm/a to 0.56 mm/a, SS304 stainless steel corrosion rate changes from 0.039 6 mm/a to 0.011 2 mm/a,which proves that influence of rotation rate in low speed range on the naphthenic acid corrosion is not obvious.