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ÔÎÄ£º With the dissolution of the Ca¨CAl¨CO impurity and the matrix, the Mg¨CAl¨CO impurity (part I) in some inclusions could detach from the matrix (Fig. 13d). On the other hand, several cationic species (such as Ca2+, Al3+, Fe2+, Ni2+, Cr3+, and so on.) were generated. Further hydrolysis reactions of these ions induced a drop in pH. Furthermore, the chloride ion permeated into the pit to maintain electro-neutrality. As a result, the auto acidification catalyticoccluded cell was formed [53], as shown in Fig. 13d. As the corrosion time increased, the acidic high-chloride ion solution could depassivate the protective passive film [10], which results in pit propagation. Finally, the stable pits were formed. Õâ¾ä»°Ã»¿´¶®£¬¿ÒÇë³æÓѰïæ·ÒëÏ£¬²»Ê¤¸Ð¼¤£¡ As a result, the auto acidification catalyticoccluded cell was formed [53], as shown in Fig. 13d. As the corrosion time increased, the acidic high-chloride ion solution could depassivate the protective passive film [10], which results in pit propagation. Finally, the stable pits were formed. ÎÄÏ׳ö´¦£ºZheng S, Li C, Qi Y, et al. Mechanism of (Mg, Al, Ca)-oxide inclusion-induced pitting corrosion in 316L stainless steel exposed to sulphur environments containing chloride ion[J]. Corrosion Science, 2013, 67(1):20-31. |
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