%0 Journal Article
%T INTERGRANULAR CORROSION AND PHOSPHOR SEGREGATION AT GRAIN BOUNDARY OF NON-SENSITIZED 00Cr25Ni22Mo2N SUPERPURE AUSTENITIC STAINLESS STEEL<br>超纯奥氏体不锈钢00Cr25Ni22Mo_2N非敏化态晶间腐蚀与磷(硅)的晶界偏聚
%A FANG Yaohua
%A XU Yuan
%A ZHANG Wenqi Nanjing Institute of Chemical Technology University of Science
%A Technology Beijing FANG Yaohua
%A associate professor
%A Deportment of Applied Chemistry
%A Nanjing Institute of Chemical Technology
%A Nanjing
%A <br>方耀华
%A 徐源
%A 张文奇
%J 金属学报
%D 1989
%I 
%X The corrosion behaviour and mechanism of superpure austenitic stain-less steel 00Cr25Ni22Mo2N in urea processing environment was studied. The resultsshow that the gas extraction tube made of non-sensitized 00Cr25Ni22Mo2N steelsuffered intergranular corrosion. Corrosive media penetrated not only into the tubewall through grain boundaries but also expanded from the boundary towards theinterior of the grain. Therefore, funnel shape penetration paths were formed, whichwere wider but less deep than common intergranular corrosion of sensitized stain-less steel. Neither depletion of Cr nor precipitates were found at the grain bound-ary. However, P (and Si) was segregated at grain boundaries to a great extent.Semiquantitative calculation indicates that P content at the grain boundary isabout 25 wt-%, three oders of magnitude higher than the content within the grain.Suggestion is made that the potential difference between the grain and its bound-ary due to the segregation resulted in the observed intergranular corrosion.
%K superpure austenitic stainless steel
%K intergranular corrosion
%K P(Si) segregation<br>超纯奥氏体不锈钢
%K 非敏化态晶间腐蚀
%K 磷(硅)的晶界伸聚
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=D3F52412370D4B9B855EDBB73682CF1B&yid=1833A6AA51F779C1&vid=C5154311167311FE&iid=B31275AF3241DB2D&sid=C753EB8AC8F551B9&eid=C36EC077A8A90308&journal_id=0412-1961&journal_name=金属学报&referenced_num=0&reference_num=1