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| Corrosion characteristics of biomass bolier steel in KCl contact condition |
| YU Chun-jiang,WANG Zhun,GONG Bin,LUO Zhong-yang |
| State Key Laboratory of Clean Energy Utilization of Zhejiang University, Hangzhou 310027, China |
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Abstract To compare the corrosion behavior of different stainless steels under typical condition of superheater in biomass fueled boiler, the experimental research was carried out. Commonly used boiler steels such as 20G, 12Cr1MoVG, Super304, SUS316, TP347H and HR3C were tested and the temperature arrangement of 550～700℃ was chosen. The corrosion characteristic curve is drawn through measuring the increment of sample weight. Detailed analysis using Energy Dispersive System(EDS), Scanning Electron Microscope(SEM) and X-ray Diffractometer(XRD) was also conducted to study the morphology features, element content and composition of corrosion products after the samples were collected. The result shows that under high-temperature, the order of those stainless steels’ resistance to KCl corrosion is HR3C>TP347H>Super304>SUS316>12Cr1MoVG>20G. The temperature and adhesion amount of KCl on the metal surface also have significant influence on the rate of corrosion. It was found that the nickel-chromium based passivation layer of the materials is reactive under KCl environment and the damage of this layer is the direct reason for high rate high-temperature corrosion.
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Published: 01 November 2014
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| Fund: 余春江（1973-），男，副教授.E-mail：chunjiang@zju.edu.cn |
生物质锅炉钢材在氯化钾接触条件下腐蚀特性
为了比较不同材料抗腐蚀特性,模拟生物质锅炉过热器区的条件,在550～700 ℃范围内对生物质锅炉常用的20G、12Cr1MoVG、Super304、SUS316、TP347H、HR3C等钢材进行腐蚀特性对比研究.通过测定试样的增重量,得出腐蚀特性曲线；利用能谱分析仪、扫描电镜和X射线衍射仪对试样腐蚀后的形貌特征、元素质量分数和腐蚀产物的组成进行分析.结果表明,在高温下,常用钢材抗KCl高温腐蚀能力的排序为HR3C>TP347H>Super304>SUS316>12Cr1MoVG>20G;温度和金属表面KCl的附着量对高温腐蚀具有重要影响;KCl高温下可以和合金钢表面镍铬氧化物钝化层反应,直接破坏钝化层的保护作用,从而加速氧化腐蚀的进行.
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