三元混合气氛腐蚀相图和四元热腐蚀相图的计算具有相通性。三元体系中,将一凝聚相视为由单质金属和气相中两个组元反应生成,而在四元体系内把凝聚相设为由单质金属、Na-O-S体系中一凝聚相和气相中的两个组元反应而成。通过其反应自由能的变化来衡量判断相图中凝聚相西两组合的平衡线和叁叁组合的三相点。
Phase stability diagrams of quaternary hot corrosion type could be constructed on the basis of calculations of ternary mixed environment type diagrams. For both systems the condensed phases were considered to be the reaction products of the metal with two components in the gas phases, while for the hot corrosion type a condensed phase of the Na-O-S system was regarded as the reactant. The equilibrium lines and the triple points in the phase stability diagrams were calculated and selected by the free energy changes associated with the assumed reactions.
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