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研究一种新型镍基合金X-1#在550℃,23 MPa含PO_4~(3-),Cl~-和SO_4~(2-)超临界水中分别腐蚀72,159,248,429和537 h的腐蚀特性.结合SEM,EDS,XRD和XPS等分析测试方法研究了X-1#合金氧化膜和反应釜沉积物的形貌、物相组成和元素成分分布等.结果表明,X-1#合金在该环境下形成了均匀和完整的氧化膜,氧化膜由疏松外层和致密内层组成,外层主要包含NiO,Ni(OH)_2和磷酸盐,内层由NiCr_2O_4和Cr_2O_3组成.腐蚀初始阶段腐蚀速率较快,248 h后腐蚀速率明显下降,这是由于氧化膜内层稳定性好且连续致密分布,有利于X-1#合金抗高温氧化腐蚀.
The corrosion behavior of a new Ni-based alloy X-1 # for 72, 159, 248, 429 and 537 h in corrosive PO_4 ~ (3 -), Cl ~ - and SO_4 ~ (2-) supercritical water at 550 ℃ and 23 MPa, respectively, X-ray diffraction (XRD), X-ray diffraction (XRD) and X-ray diffraction (XPS) were used to investigate the morphology, phase composition and elemental composition of X-1 # alloy oxide film and reactor. Uniform and complete oxide film, the oxide film is composed of loose outer layer and dense inner layer, the outer layer mainly contains NiO, Ni (OH) _2 and phosphate, the inner layer is composed of NiCr_2O_4 and Cr_2O_3.The initial corrosion rate is faster , The corrosion rate decreased obviously after 248 h, which is due to the good stability and continuous dense distribution of the inner layer of the oxide film, which is in favor of the high temperature oxidation corrosion resistance of the X-1 # alloy.