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在T=800℃,Ps_2=10~(-6)大气压,Po_2=5×10~(-21)~5×10~(-20)大气压(即靠近Cr_3S_4—Cr_2O_3热力学边界的Cr_2O_3稳定区中)的条件下,对纯铬和镍铬合金进行了高温腐蚀试验。在腐蚀的最初阶段,Cr_8S_4与Cr_2O_3同时生成,而且腐蚀层呈针状结构。当反应温度及硫分压不定时,合金成份及氧分压的改变对于针状结构的发育有明显的影响。作者对反应的机理进行了讨论。
Under the condition of T = 800 ℃, Ps_2 = 10 ~ (-6) and Po_2 = 5 × 10 ~ (-21) ~ 5 × 10 ~ (-20), ie, Cr_2O_3 near the thermodynamic boundary of Cr_3S_4-Cr_2O_3, Under the conditions of pure chromium and nickel-chromium alloy high temperature corrosion test. In the initial stage of corrosion, Cr_8S_4 and Cr_2O_3 are formed at the same time, and the corrosion layer is acicular structure. When the reaction temperature and the partial pressure of sulfur are not fixed, the changes of alloy composition and partial pressure of oxygen have obvious influence on the development of acicular structure. The author discusses the reaction mechanism.