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为提高火力发电的效率,现代超高温高压锅炉的蒸汽温度已达600～650℃。这样,使过热器管的表面温度正好处于受碱金属和铁的硫酸复盐〔如Na_3Fe(SO_4)_3〕侵蚀的最严重的温度范围。为此,必须重视和研究过热器管在煤灰环境中的腐蚀问题。本工作用电化学方法在650℃熔融的三元低熔点共晶混合物(78 Li_2SO_4+13.5 K_2SO_4+8.5Na_2SO_4,mol%)中研究了17-14 CuMo,SUS347H,SUS 310S,35Cr-45Ni不锈钢过热器管材的耐腐蚀性。结果表明,这些材
To improve the efficiency of thermal power generation, the steam temperature of modern ultra-high temperature and high pressure boilers has reached 600 ~ 650 ℃. In this way, the surface temperature of the superheater tube lies exactly in the most severe temperature range eroded by alkali metal and iron double salts of sulfuric acid, such as Na 3 Fe (SO 4) 3. To this end, we must attach importance to and study of superheater tube corrosion in the coal ash environment. In this work, the electrochemical behavior of 17-14 CuMo, SUS347H, SUS 310S and 35Cr-45Ni stainless steel superheaters was investigated in a ternary low melting eutectic (78 Li 2 SO 4 + 13.5 K 2 SO 4 + 8.5 Na 2 SO 4, mol%) melt at 650 ℃. Pipe corrosion resistance. The results show that these materials