CuPCr钢显微组织对全浸海水腐蚀行为的影响

为考察CuPCr型耐海水腐蚀钢不同显微组织的腐蚀行为,采用热轧后不同冷却方式分别获得贝氏体和铁素体+珠光体组织,进行模拟海水腐蚀的全浸加速腐蚀实验,并利用失重法测量腐蚀速率,采用SEM,XRD和电化学方法评价钢的腐蚀行为.结果表明:贝氏体组织能够在更短时间内形成比较致密的锈层,其耐蚀性能明显优于铁素体和珠光体组织.碳元素在贝氏体中的均匀分布减少了微电池数量,因而能够降低钢的腐蚀电流密度.

Effects of Different Microstructures of CuPCr Alloy Steel on Its Marine Immersion Corrosion Behavior

To investigate the marine corrosion behavior of the CuPCr alloy steel with different microstructures, the bainite and ferrite plus pearlite structures were prepared after hot rolling at different cooling rates to provide specimens for fully immersed marine corrosion tests in which the corrosion was accelerated. The corrosion rate was determined by weight loss measurement. SEM, XRD and electrochemical characterization were used to evaluate the corrosion behaviors. The testing results showed that the bainitic structure can form compact corrosion layer on its surface in a shorter time, of which the corrosion resistance is obviously higher than ferrite plus pearlite structure. The uniform distribution of carbon in bainite decreases the number of microcells in substrate, thus reducing the corrosion current density of the steel.