Carbon fiber reinforced plastics (CFRP) are promising lightweight materials for vehicle applications. 316L is one of the most widely used types of austenite stainless steels and applied in lots of automotive applications. The existence of crevices will result in galvanic corrosion and crevice corrosion when CFRPs and 316L are directly connected. A crevice former for the galvanic system was therefore designed and applied to evaluate the crevice corrosion behaviors and study the mechanism of galvanic crevice corrosion through several electrochemical techniques in this research. The results showed that the crevice corrosion of galvanic systems grew from crevice mouth to the inside crevice and could be divided into four steps, metastable pitting corrosion at the crevice mouth, initiating step of crevice corrosion, propagating step and ending step of crevice corrosion. Because of the influences of the galvanic system, electrode reaction rates were speeded up and the passivation region was shortened at the initiating stage of crevice corrosion. Corrosion rate was observed to be higher in the galvanic system than that in normal crevice systems.

中文翻译：

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汽车应用CFRP和316L不锈钢之间的缝隙腐蚀行为

碳纤维增强塑料（CFRP）是用于汽车应用的有前途的轻质材料。316L是奥氏体不锈钢使用最广泛的类型之一，并应用于许多汽车应用中。直接连接CFRP和316L时，缝隙的存在会导致电偶腐蚀和缝隙腐蚀。因此，设计了一种用于电偶系统的缝隙形成器，并将其用于评估缝隙腐蚀行为并通过几种电化学技术研究电缝隙腐蚀的机理。结果表明，电流系统的缝隙腐蚀从缝隙口向内部缝隙扩展，可分为四个步骤：缝隙口处的亚稳态点蚀，缝隙腐蚀的起始步骤，缝隙腐蚀的扩展步骤和结束步骤。由于电流系统的影响，在缝隙腐蚀的起始阶段，电极的反应速度加快，钝化区缩短。电流系统中的腐蚀速率高于常规缝隙系统。