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Intergranular corrosion of high temperature alloys in molten fluoride salts

机译：熔融氟盐中高温合金的晶间腐蚀

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Six Ni and Fe-Ni based austenitic alloys were exposed to molten LiF-NaF-KF : 46.5-11.5-42 mol% salt, commonly referred to as FLiNaK, at 850℃ for 500 h. Corrosion was noted to occur predominantly from dealloying of Cr resulting in void formation, an effect that was particularly pronounced at the grain boundaries. Alloy weight-loss due to molten fluoride salt corrosion correlated with the initial Cr-content of the alloys up to a Cr content of about 20 wt%, and was consistent with the Cr-concentrations measured in the salts after corrosion tests. However, in the nominally 20 wt% to 23 wt% Cr containing alloys, this weight-loss correlated linearly with the carbon content of the alloys,due to the formation of chromium carbide phases at the grain boundaries and its subsequent dissolution into the molten salt along the grain boundaries. The Cr-lean intermetallic precipitates found in the alloys were resistant to corrosion in the molten FLiNaK salt.
机译：在850℃下，将六种Ni和Fe-Ni基奥氏体合金暴露于熔融的LiF-NaF-KF：46.5-11.5-42 mol％的盐（通常称为FLiNaK）中，暴露500小时。注意到腐蚀主要是由于Cr的脱合金而导致形成空洞，这种现象在晶界处尤为明显。由熔融的氟化物盐腐蚀引起的合金重量损失与合金的初始Cr含量有关，直到约20wt％的Cr含量，并且与腐蚀试验后在盐中测得的Cr浓度一致。但是，在名义上含20％（重量）至23％（重量）的含Cr合金中，这种重量损失与合金中的碳含量呈线性关系，这是由于在晶界形成了碳化铬相并随后溶入了熔融盐中沿着晶界。在合金中发现的贫铬金属间沉淀物可抵抗熔融的FLiNaK盐中的腐蚀。

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