Shi Weining, Yang Shufeng, Li Jingshe
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Sci Rep. 2018 Mar 19;8(1):4830. doi: 10.1038/s41598-018-23273-x.
Effects of the evolution of inclusions on the pitting corrosion resistance of 304 stainless steel with different contents of the rare-earth element yttrium (Y) were studied using thermodynamic calculations, accelerated immersion tests, and electrochemical measurements. The experimental results showed that regular YO inclusions demonstrated the best pitting resistance, followed in sequence by (Al,Mn)O inclusions, the composite inclusions, and irregular YO inclusions. The pitting resistance first decreased, then increased, and then decreased again with increasing Y content, because sulfide inclusions were easily generated when the Y content was low and YN inclusions were easily generated at higher Y contents. The best pitting corrosion resistance was obtained for 304 stainless steel with addition of 0.019% Y.
利用热力学计算、加速浸泡试验和电化学测量方法，研究了不同稀土元素钇（Y）含量的304不锈钢中夹杂物演变对其耐点蚀性能的影响。实验结果表明，规则的YO夹杂物表现出最佳的耐点蚀性能，其次依次为（Al,Mn）O夹杂物、复合夹杂物和不规则YO夹杂物。随着Y含量的增加，耐点蚀性能先降低，然后升高，随后又降低，这是因为当Y含量较低时容易生成硫化物夹杂物，而在较高Y含量时容易生成YN夹杂物。添加0.019%Y的304不锈钢获得了最佳的耐点蚀性能。
