摘要
采用间歇式超临界水氧化装置,对316L不锈钢网状试样和块状试样在超临界水氧化处理城市污泥环境中的腐蚀特性进行了研究。结果表明,试样的腐蚀程度随氧化系数的提高而加剧,碱性条件下网状试样表面有富含Mo和Ni的丝状无机盐生成。与网状试样不同,块状试样在高氧化系数和酸性条件下均表现出点蚀形貌,在酸性条件下腐蚀速率最高达0.17 mm/a,经历高氧化系数(2.0)、酸性(pH=5.2)和碱性(pH=10.05)条件下分别腐蚀10 h后,块状试样表面呈现点蚀形貌,表层氧化物主要为Fe_3O_4-NiFe_2O_4。
The corrosion behavior of 316L stainless steel netlike and block samples was studied in city sewage sludge treated by supercritical water oxidation （SCWO）. The results showed that the corrosion of 316L was enhanced as the oxidation coefficient increased. Filament mineral salts rich in Mo and Ni were found on the outer surface of the net like sample under alkaline condition. Different from the net like sample, on the block sample pitting corrosion morphology was observed under the acidity and high oxidation conditions. 316L had the highest corrosion rate of 0.17 mm/a under the acid SCWO condition. The surface oxide on the block sample was mainly Fe3O4-NiFe2O4 and pitting corrosion was observed under the testing conditions of high oxidation coefficient （2. 0）, acidity （pH=5.2） and alkalinity （pH=10. 05） for 10 h.
出处
《腐蚀与防护》
CAS
北大核心
2011年第7期501-506,共6页
Corrosion & Protection
基金
国家高技术研究发展计划863项目(No.2006AA06Z313)
