模拟汽车动态工况下SPHC钢的腐蚀行为  

Corrosion Behavior of SPHC Steel under Simulated Vehicle Dynamic Conditions

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作  者:陈伟 张宝 郭晓亮 尚生 CHEN Wei;ZHANG Bao;GUO Xiaoiang;SHANG Sheng(CATARC Automotive Test Center(Hulunbuir)Company Limited,Hulunbuir 021000,China)

机构地区:[1]中汽研汽车检验中心(呼伦贝尔)有限公司,内蒙古呼伦贝尔021000

出  处:《汽车实用技术》2023年第21期126-130,共5页Automobile Applied Technology

摘  要:文章通过热轧钢板(SPHC)钢在汽车动态行驶过程中,经过温湿度环境仓运行后的腐蚀速率,并采用扫描电子显微镜(SEM)检测手段分别分析了SPHC钢经历7天、11天、15天试验后的锈层微观形貌,初步探究SPHC钢在特定工况下的腐蚀变化规律。结果表明,在模拟汽车动态工况下,SPHC钢每天喷3%NaCl的腐蚀速率要高于0.5%NaCl,但是两者的腐蚀速率都随着试验时间呈现相同趋势的非线性变化。当试验1天至7天时,腐蚀速率先急剧增大,锈层表面及其中间具有大量的裂纹,此时为初期加速腐蚀;当试验到11天时,腐蚀速率下降到低点,此时锈层较为致密,增强了SPHC钢的耐蚀性;当试验到15天时,腐蚀速率又上升到一个高点。此时锈层剥落,基体严重腐蚀,耐蚀性最差。In this paper,the corrosion rate of steel plate heat-commercial(SPHC)steel after running in temperature and humidity in the dynamic driving process of a car is analyzed by scanning electron microscopy(SEM),and the microscopic morphology of the rust layer of SPHC steel after 7 days,11 days and 15 days of testing is used to initially explore the corrosion change rule of SPHC steel under specific working conditions.The results show that the corrosion rate of SPHC steel spraies with 3%NaCl per day is higher than that of 0.5%NaCl under simulated vehicle dynamic conditions,but the corrosion rate of both steel shows the same trend of nonlinear change with the test time.When the test time is from 1 to 7 days,the corrosion rate first increases sharply,and the surface and middle of rust layer have a large number of cracks,which is the initial accelerated corrosion at this time.When the test time reached 11 days,the corrosion rate drops to the low point,and the rust layer is relatively dense,which enhanced the corrosion resistance of SPHC steel.When the test time reached 15 days,the corrosion rate rises the high point again.At this time,the rust layer peels off,the matrix is severely corroded,and the corrosion resistance is the worst.

关 键 词:SPHC钢 汽车动态工况 环境仓 腐蚀行为 

分 类 号:TQ515.9[化学工程] U466[机械工程—车辆工程]

 

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