在连续式超临界水氧化试验装置中，测量了316不锈 钢和825镍基合金在150℃～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，825镍基合金的腐蚀速度比316不锈钢的腐蚀速度小，450℃下316不 锈钢和825镍基合金的均匀腐蚀速度分别达143 μm/h和125 μm/h；200℃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.
Corrosion of 316 stainless steel and 825 nickel base alloy in medium of supercritical water oxidizing (SCWO) a pesticide chlorpyri fos has been studied at temperature 150～450℃ in a continuous SCWO facili ty.General corrosion rates of the alloys increase with increase of temperature.8 25 nickel base alloy has smaller corrosion rate than 316 stainless s teel.At 450℃corrosion rates were 143μm/h and 125μm/h respectively for 316 stainless steel and 825 nickel base alloy.Pitting corrosion occurs at temperatu re higher than 200℃.Pitting corrosion plus general dissolution at higher temper atures results in wide open pit corrosion morphology.Thermodynamic analysis show s that Fe-Cr-Ni alloys is not stable in SCWO conditions because Cr2O3 is not stable in these conditions.Formation of low melt po int metal chlorides may also be a reason for the high corrosion rates of the all oys.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%