在12％(NH_4)_2SO_4水溶液(调pH=9)中,电位在200—800mV(SCE)范围内实现了M_(17)G镍基高温合金中M_(23)C_6相的选择性阳极浸蚀。用线性扫描电位法和恒电位阶跃法研究了浸蚀过程,建立了电化学极化控制下细小、弥散相的选择性阳极浸蚀过程模型。
The particles of M_(23)C_6 precipitate in Ni-base superalloy M17G were selectively dissolved in an aqueous solution of 12％(NH_4)_2SO_4 (pH-value was adjusted to 9) in the potential range of +200 to +800 mV (S. C. E.). The anodie dissolution process has been investigated in terms of potential-sweep and potential-step polarization techniques. For the finely dispersive phase in the alloy, a new model has been developed to describe the selective anodic dissolution process, which is eontrolled by electrochemical polarization.
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