【摘要】 在连续式超临界水氧化试验装置中 ,测量了 31 6不锈钢和 82 5镍基合金在 1 50℃～ 450℃分解杀虫剂毒死蜱过程中的腐蚀速度 .两种合金的均匀腐蚀速度随温度升高而增加 ,82 5镍基合金的腐蚀速度比 31 6不锈钢的腐蚀速度小 ,450℃下 31 6不锈钢和 82 5镍基合金的均匀腐蚀速度分别达 1 4 3μm/h和 1 2 5μm/h ;2 0 0℃以上发生孔蚀 ,在较高分解温度下 ,由于孔蚀和均匀腐蚀的同时进行 ,形成相互贯穿的敞口蚀坑腐蚀形貌 .热力学分析表明 ,Fe -Cr-Ni合金在高温氧化性介质中是不稳定的 ,并且低熔点金属氯化物的产生也可能是合金在超临界条件下出现高腐蚀速度的原因之一更多还原

【Abstract】 Corrosion of 316 stainless steel and 825 nickel base alloy in medium of supercritical water oxidizing (SCWO) a pesticide chlorpyrifos has been studied at temperature 150～450℃ by using a continuous SCWO facility.General corrosion rates of the alloys increase with increase of temperature.825 nickel base alloy has smaller corrosion rate than 316 stainless steel.At 450℃corrosion rates were 14 3μm/h and 12 5μm/h respectively for 316 stainless steel and 825 nickel base alloy.Pitting corrosion occurs at temperature higher than 200℃.Pitting corrosion plus general dissolution at higher temperatures results in wide open pit corrosion morphology.Thermodynamic analysis shows that Fe-Cr-Ni alloys is not stable in SCWO conditions because Cr 2O 3 is not stable in these conditions.Formation of low melt point metal chlorides may also be a reason for the high corrosion rates of the alloys.更多还原