Chinese Journal of Applied Chemistry ›› 1992, Vol. 0 ›› Issue (4): 114-116.

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ON THE TRANSPASSIVATION AND POSTTREATMENT OF STAINLESS STEEL

Song Guangling, Cao Chunan, Xia Bangjie, Lin Haichao   

  1. Institute of Corrosion and Protection of Metals, Academia Sinica, Shenyang 110015
  • Received:1992-01-06 Revised:1992-03-09 Published:1992-08-10 Online:1992-08-10

Abstract: The activation time of transpassive film formed on 304 stainless steel in the transpassivation region is almost 2 magnitude of order higher than that of passive film formed in passivation region and its breakdown potential is strikingly improved if post-treatment is conducted in a McO42- containing solution.It is believed that the enhancement of stability of surface film by transpassivation and post-treatment is ascribed to increase of film thickness,higher ratio of Fe3+/Fe2+ and the adsorption of molybdenum into film.

Key words: 304 stainless steel, passivation, transpassivation, molybdate, post treatment