摘要
工业纯钛以其优良的耐蚀性能被认为是作为火电厂脱硫湿烟囱防腐内衬的理想材料,采用腐蚀电化学的方法系统研究了环境因素对TA2纯钛在模拟脱硫湿烟气冷凝液中耐蚀性能的影响。研究结果表明,纯钛的耐蚀性能主要取决于冷凝液的p H值和HF含量,当p H值大于3.0或者HF含量足够低时,纯钛表现为自钝化行为,具有较高的耐蚀性,反之其表现为活化-钝化行为,耐蚀性较差。另外,温度和流速均能加速纯钛在模拟冷凝液中的腐蚀速率,其机制都是加速了HF所引起的阳极钝化膜的溶解过程。
Due to fine corrosion resisting property,industrial pure titanium is considered as the ideal material for thermal power plant desulfurization wet stack anti-corrosion liner.Adapted corrosion electrochemistry method,the effect of environment factor to corrosion resisting property on TA2 pure titanium in simulated desulfurized wet flue gas condensate was studied.The result indicated that the corrosion resisting property of pure titanium was mainly determined by pH and HF content of the condensate.If pH is higher than 3.0 or HF content is low enough,pure titanium is in self-passivation behavior,with high corrosion resisting property.In contrast,pure titanium is in activation-passivation behavior,corrosion resisting property is relatively poor.In addition,temperature and flow velocity of condensate increased corrosion rate.Other changes were caused by anodic passive film dissolution due to HF was accelerated.
出处
《华电技术》
CAS
2016年第12期45-49,69,共6页
HUADIAN TECHNOLOGY
关键词
纯钛
极化曲线
耐蚀性能
脱硫湿烟气冷凝液
环境因素
pure titanium
polarization curve
corrosion resisting property
desulfurized wet flue gas condensate
environmental factor
