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选用两种常见的Ni基高温合金GH4033和GH4169,通过520℃熔融Na Cl-52 mass% MgCl_2完全浸没试样腐蚀实验,测量了160 h内试样在高温熔盐中的腐蚀行为。借助SEM、XRD等方法对腐蚀20 h和160 h试样的表面、横截面形貌及成分进行了表征。结果表明,两种试样的腐蚀动力学曲线均满足分段线性规律。腐蚀20 h后,两种试样表面均疏松多孔,且GH4169出现富含Mg和O的壳层结构。横截面形貌及成分分析表明GH4033和GH4169横截面上腐蚀层深度约为30μm和50μm。两种试样的腐蚀机理分别为Cr、Ni的流失和Fe、Cr的流失。
Two common Ni-based superalloys, GH4033 and GH4169, were selected and their corrosion behavior was completely immersed in molten NaCl-52 mass% MgCl 2 at 520 ℃ for 160 h. The surface, cross-sectional morphology and composition of the samples after 20 h and 160 h corrosion were characterized by means of SEM and XRD. The results show that the corrosion kinetic curves of the two samples satisfy the piecewise linear rule. After 20 h of corrosion, the surface of both samples were porous and porous, and the shell structure of Mg-O and O-rich in GH4169 appeared. Cross-sectional morphology and composition analysis showed that the cross-sectional GH4033 and GH4169 corrosion layer depth of about 30μm and 50μm. The corrosion mechanisms of the two samples are the loss of Cr, Ni and the loss of Fe and Cr, respectively.