杂质氯离子对新型四元硝酸盐腐蚀性的影响

INFLUENCES OF IMPURITY CHLORIDE ION ON CORROSION OF NEW QUATERNARY NITRATE

为了探究低氯离子含量(0.01%~0.05%,质量分数)对熔盐与金属材料腐蚀过程的影响,该文采用失重法研究316L不锈钢与氯离子质量分数为0.01%、0.03%、0.05%的混合硝酸盐的腐蚀行为。结果发现,在经过360 h的腐蚀实验后,316L不锈钢在氯离子质量分数为0.03%的熔盐中具有最小的失重量,其为0.4381 mg/cm^(2)。采用SEM、EDS、XRD等方法对316L不锈钢表面形貌进行分析,结果表明,在添加氯离子后不锈钢的腐蚀产物中出现Ca(OH)_(2),在Ca(OH)_(2)的形成过程会消耗氢氧根离子,从而降低了不锈钢失重量。

In order to explore the influence of molten salt with low chloride ion content(0.01%-0.05%,mass fraction)on the corrosion process of metal materials.By means of weight loss method,the corrosion behavior of 316L stainless steel in mixed molten salts with chloride ion mass fraction of 0.01%,0.03% and 0.05% was studied.The results show that the minimum weight loss of 316L stainless steel in molten salt with chloride ion mass fraction of 0.03% is 0.4381 mg/cm^(2) after 360 h of corrosion test.The surface morphology analysis by SEM,EDS and XRD test showed that Ca(OH)_(2)appears in the corrosion products of stainless steel after adding chloride ions.During the formation of Ca(OH)_(2)mayhydroxyl ion are consumed,thus reducing the weight loss of stainless steel.