摘要
国内某台振动炉排的生物发电锅炉,累计运行仅200天后,二级过热器(材质为12Cr1MoVG)外壁即发生严重的腐蚀。对管子外壁附近进行了显微组织、EDS成分和XRD分析。发现:腐蚀优先沿晶界发展,腐蚀前沿富含氯离子。认为生物质燃料中的氯离子是造成管子外壁腐蚀的主要原因,而碱金属的存在由于形成低熔点共晶物会促进腐蚀过程。提出了降低腐蚀速率的措施。
The 12CrlMoV secondary super-heater of a biomass vibration grate boiler suffered serious surface corrosion after service for only 200 h. Tubes were analyzed by optical microscopy, EDX and XRD. Grain boundary attack was found, and Cl- was rich at reaction front. The corrosion was ascribed mainly to CI in the biomass. The existence of alkali metal may promote tbe corrosion process because it tends to form low mehing point salts. Some measures were proposed to reduce the corrosion rate.
出处
《腐蚀与防护》
CAS
北大核心
2012年第9期823-825,共3页
Corrosion & Protection
