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Effect of dissolved precursors on corrosion characteristics of Ni-based alloy Inconel 625, stainless steel 316L and titanium alloy TA2 in acidic and neutral supercritical water: A comparative study
The Journal of Supercritical Fluids ( IF 3.9 ) Pub Date : 2024-03-18 , DOI: 10.1016/j.supflu.2024.106249
Guanyu Jiang , Lu Liu , Donghai Xu , Huanteng Liu , Mingjun Wang , Jianqiao Yang

This work investigated the corrosion characteristics of nickel-based alloy Inconel 625, stainless steel 316L (SS 316L), and commercial grade 2 titanium alloy (TA2) in ZrO(NO)-containing and ZrO(NO)/KOH-containing supercritical water (SCW) at 400 °C and 25 MPa. During ZrO(NO)-containing SCW exposure, Inconel 625 undergoes pitting and intergranular corrosion, while SS 316L and TA2 suffer uniform corrosion. Based on corrosion rate and metal oxide stability, the corrosion resistance follows an order of TA2 > Inconel 625 > SS 316L. The addition of KOH reduces the intergranular corrosion sensitivity of Inconel 625, and leads to different oxide distribution of SS 316L. The thick TiO oxide layer mixed with ZrO formed in ZrO(NO)/KOH-containing SCW enables TA2 to exhibit superior corrosion resistance than Inconel 625 and SS 316L.

中文翻译:

溶解前驱体对镍基合金Inconel 625、不锈钢316L和钛合金TA2在酸性和中性超临界水中腐蚀特性的影响比较研究

这项工作研究了镍基合金 Inconel 625、不锈钢 316L (SS 316L) 和商用 2 级钛合金 (TA2) 在含 ZrO(NO) 和含 ZrO(NO)/KOH 的超临界水中的腐蚀特性( SCW)在 400 °C 和 25 MPa 下。在含 ZrO(NO) 的 SCW 暴露过程中,Inconel 625 会发生点蚀和晶间腐蚀,而 SS 316L 和 TA2 会发生均匀腐蚀。根据腐蚀速率和金属氧化物稳定性,耐腐蚀性遵循TA2 > Inconel 625 > SS 316L的顺序。 KOH的添加降低了Inconel 625的晶间腐蚀敏感性,并导致SS 316L的氧化物分布不同。在含 ZrO(NO)/KOH 的 SCW 中形成的与 ZrO 混合的厚 TiO 氧化物层使 TA2 表现出比 Inconel 625 和 SS 316L 更优异的耐腐蚀性。
更新日期:2024-03-18
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