烟囱用耐候钢在海水脱硫中的腐蚀研究及寿命预测

通过电化学技术、现场暴露试验研究了海水脱硫对电厂烟囱钢内衬Corten4N的腐蚀行为影响，并利用灰色模型GM（1，1）对烟囱内衬在实施海水脱硫工艺后的使用寿命进行了预测。研究结果表明，实施海水脱硫工艺后会加速烟囱内衬Corten钢的腐蚀且在烟囱140112高度附近腐蚀速率最大；Corten钢在腐蚀初期腐蚀速率逐渐增大，约1a后进入稳定腐蚀状态；Corten钢焊缝区相对于基体是阴极，处于被保护状态；Corten钢在海水脱硫烟气中最大腐蚀速率的灰色预测公式为x（k＋1）=-0.43211e-0.10515k＋0.45811。

Corrosion Study and Life Prediction of Weathering Steel for Chimney in Seawater Desulfurization

The influence of seawater desulfurization on the corrosion behavior of Corten steel-weathering steel for chimney was studied based on electrochemical techniques and field exposure test. The service life of chimney lining was forecasted after implementing seawater desulfurization to the chimney lining by using grey model GM（ 1,1 ）. The result showed that the implement of seawater desulfurization accelerates the corrosion of Corten steel for chimney lining and the corrosion rate reaches maximum at 140-meter high place of the chimney; the corrosion rate of Corten steel increases gradually at the initial stage and the corrosion rate of Corten steel becomes stable about 1 year later; the weld area of Corten steel is cathode relative to the base and in a protected status; in the fuel gas of seawater desulfurization, the grey forecast formula of maximal corrosion rate of Corten steel is x（k＋1）=-0.43211e-0.10515k＋0.45811.