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首页> 外文会议>The 3rd China-Korea Joint Symposium on Advanced Steel Technology >EFFECTS OF NITROGEN ON CRITICAL PITTING TEMPERATURE AND CREVICE CORROSION BEHAVIORS OF TYPES 316L AND 316LN AUSTENITIC STAINLESS STEELS
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EFFECTS OF NITROGEN ON CRITICAL PITTING TEMPERATURE AND CREVICE CORROSION BEHAVIORS OF TYPES 316L AND 316LN AUSTENITIC STAINLESS STEELS

机译：氮对316L和316LN奥氏体不锈钢临界点蚀温度和小孔腐蚀行为的影响

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摘要

The alloying element, nitrogen (N) is known to improve the resistance to the localized corrosion such as pitting and crevice corrosion of austenitic stainless steels. Effects of N addition on the resistances to localized corrosion of types 316L and 316LN austenitic stainless steels were investigated in the aqueous 1N NaCl solution. In order to compare the pitting corrosion resistance between stainless steels, critical pitting temperatures were measured with the change of N content, according to ASTM G-150 specification. Crevice corrosion tests were performed with the artificial crevice by using the specially designed crevice cell apparatus with both a crevice manupulator and a luggin probe. Results showed that the increase in N content caused the increase in the critical pitting temperature. N also led to improve the crevice corrosion resistance due to the decrease in the potential-drop while the increase in the solution temperature caused the expansion of the crevice region, increasing the potential-drop within the crevice. The acidification within crevice was also attributed to the crevice corrosion, in addition to the increase of the potential-drop of the inside of crevice.
机译：已知合金元素氮（N）可以提高对局部腐蚀的抵抗力，例如奥氏体不锈钢的点蚀和缝隙腐蚀。在1N NaCl水溶液中研究了氮添加对316L和316LN型奥氏体不锈钢耐局部腐蚀性能的影响。为了比较不锈钢之间的抗点蚀性能，根据ASTM G-150规范，通过改变N含量来测量临界点蚀温度。缝隙腐蚀试验是通过使用专门设计的缝隙单元设备和缝隙操纵器和木瓜探针对人造缝隙进行的。结果表明，氮含量的增加导致临界点蚀温度的升高。 N还由于电位降的降低而提高了缝隙的耐腐蚀性，而固溶温度的升高导致缝隙区域的扩大，从而增加了缝隙内的电位降。缝隙内的酸化除了缝隙内部的电位降增加外，还归因于缝隙腐蚀。

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