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。
The simultaneous oxidation and sulfidation of chromium and nickel-chromium alloys was studied at 800 C in the atmospheres of ps_2=1×10~(-6) atm. and po_2=5×10~(-21)-5×10~(-20) atm., which are within the Cr_2O_3 stability field and just beside the Cr_3S_4-Cr_2O_3 equilibrium boundary of Ellingham diagram for Cr-O-S. It was found that, at the initial reaction stage, Cr_3S_4 was formed along with Cr_2O_3 and scales were in the form of texture strueture. Aninereasein the oxygen partial pressure or a decrease in chromium content in the alloys restrained the development of the texture structure. The reaction mechanism is discussed.
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