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对于易钝化的金属来讲,在某些介质中易发生局部腐蚀.局部腐蚀的发生取决于其表面膜的破坏与修复.暴露于介质中的金属表面膜被去掉后,其稳定电位Es突然向负方向移动,达到一个最低值E_(PK),然后逐渐恢复到稳态,如图1所示.电位的负方向移动标志着一个无膜表面的形成,而电位的恢复反映了无膜表面重新形成钝化膜的过程.峰值电位E_(PK)与稳定电位Es之差△E=E_(PK)-E_s是随着作用在金属表面上的载荷而改变,△E大小反映了金属无膜表面反应活性高低程度.本文探讨了机械载荷作用下,K_2Cr_2O_7缓蚀剂对304不锈钢无膜表面电位△E的影响,并论证了K_2Cr_2O_7的缓蚀行为.
For passivated metal, local corrosion is easy to occur in some mediums. The occurrence of localized corrosion depends on the destruction and repair of the surface film. When the metal surface film exposed to the medium is removed, its steady potential Es suddenly Moving in the negative direction to a minimum E_ (PK) and then gradually returning to steady state, as shown in Figure 1. The negative displacement of the potential signifies the formation of a membrane-free surface and the recovery of potential reflects the membrane-free surface The process of re-forming the passivation film.The difference between the peak potential E_ (PK) and the steady potential Es △ E = E_ (PK) -E_s is with the load acting on the metal surface changes △ E size reflects the metal film The effect of K_2Cr_2O_7 corrosion inhibitor on the membrane-free surface △ E of 304 stainless steel under mechanical loading was discussed, and the corrosion inhibition behavior of K_2Cr_2O_7 was also demonstrated.