Corrosion lifetime evaluation of materials

It is generally assumed that HTC follows a linear rate law or a parabolic rate law as follows  

To derive the least-square value of these constants, nonlinear regression analysis was performed using a statistical analysis program. A total of 185 field test data were used for the regression analysis. Air-cooled probes consisting of various alloys were exposed at three actual stoker-type WTE boilers for 700, 3000 and 6000 hours. Test conditions are summarized in Table 19.4. The metal temperature of the probes was controlled at 450 and 550°C. The obtained and derived regression equations for and are shown below  

In recent years, WTE plants have been obliged to satisfy many additional requirements such as the suppression of pollutants, improvement of power generation efficiency, material recycling, etc. Various combustion methods and plant systems have been adopted, and the HTC environment of the 

28 Comparison of the calculated values K ) from Eq. (19.5) to observed values (Kp ). 

Kawahara, Recent Trends and Future Subjects on High-Temperature Corrosion-Prevention Technologies in High-Efficiency Waste-to-Energy Plants, Corros. Eng., 2005, 54, pp 213-235 

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