<正> 燃气涡轮高温台金部件在600～850℃之间由熔盐引起的加速腐蚀(低温热腐蚀)现象,是当前热腐蚀研究中的一个重要问题,一般舰船及一些工业涡轮的热腐蚀多属此类。 关于镍基合金的加速腐蚀机制,目前已有许多研究,但尚未获得很好的解释。本工作对纯镍在705℃几种不同条件下的熔盐腐蚀行为进行了研究,并对镍的加速腐蚀机制进行了探讨。
Sulfate-induced accelerated corrosion of nickel has been studied at 750℃ both with the method of Na_2SO_4-eoating test in O_2-0.45％(SO_2+SO_3) (1atm), and with the crucible-test in air in which the specimens are tatally inmersed in the molten NiSO_4-Na_2SO_4 salts mixture. Nickel is rapidly corroded under both circumstances, and an intermixed(NiO+Ni_3S_2)layer is formed as the major corrosion product. The islands of Ni_3S_2 in the intermixed layer are found to be inter-connected with each other. The NiSO_4-Na_2SO_4 melt may act as an oxidant by liberating corrosive gas (SO_3) and cause rapid corrosion of nickel.
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