Abstract: Many carbon steel exposure tests under static atmosphere or accelerated corrosion tests of carbon steel parts under static conditions in the room can not reflect the dynamic corrosion of carbon steel, and relatively little attention has been paid to the dynamic investigation of carbon steel in China. In this paper, the corrosion behavior of steel plate heat commercial (SPHC) steel under the condition of automobile enhanced corrosion test is studied, and the morphology, composition and phase of the etched surface of SPHC steel are analyzed by means of scanning electron microscope, energy spectrum and X-ray diffractometer. The results show that the corrosion rate of SPHC steel under dynamic conditions is higher than that under static conditions, but the change trend of corrosion rate is basically the same under the two conditions. When the test is 3 to 7 days, the corrosion rate first increased sharply, Fe2O3 is formed on the surface, and the initial corrosion is accelerated; At the 11th day of the test, the corrosion rate begins to drop to a low point, and Fe2O3 and α-FeOOH are formed on the corrosives. At this time, the rust layer is relatively dense, which enhances the corrosion resistance of SPHC steel; When the test reached the 14th day, the corrosion rate began to rise again. Fe2O3, trace alpha-Feooh and Fe2O3 corrosion products are generated on the surface of SPHC steel. At this time, the rust layer is peeling off and the corrosion is more serious.

Key words: SPHC steel; Dynamic and static corrosion conditions; Corrosion behavior

摘要： 很多碳钢在静态大气下的暴露试验或者碳钢零部件在室内静态下的加速腐蚀试验研究 不能反映出碳钢在动态中的腐蚀状况，且国内在碳钢动态探究方面关注得相对较少。文章研 究了热轧钢板（SPHC）钢在汽车强化腐蚀试验工况下的腐蚀行为，并采用扫描电子显微镜、 能谱仪、X 射线衍射仪等检测手段分析了 SPHC 钢腐蚀面的微观形貌、成分和物相。结果表 明，SPHC 钢在汽车动态下的腐蚀速率高于静态，但在两种工况下的腐蚀速率变化趋势基本 一致。当试验 3 至 7 天时，腐蚀速率先急剧增大，表面生成 Fe2O3，此时为加速初期腐蚀；当 试验到 11 天时，腐蚀速率开始下降到低点，腐蚀面生成 Fe2O3 和具有保护性的 α-FeOOH，此 时锈层较为致密，增强了 SPHC 钢的耐蚀性；当试验到 14 天时，腐蚀速率又开始呈现上升的 趋势，SPHC 钢表面生成 Fe2O3、微量的 α-FeOOH 和 Fe3O4 等腐蚀产物，此时锈层剥落，腐蚀 更为严重。

关键词: SPHC 钢；动静态腐蚀工况；腐蚀行为