Optimization of cyclic oxidation parameters in steel-T21 for aluminization coating using taguchi-ANOVA analysis by MINITAB13

Abstract EN

The increasing demands for high quality coatings has made it inevitable that the surface coating industry would put more effort into precisely controlling the coating process relative to media for which is subjected.

Statistical design of experiments is an effective method for finding the optimum cyclic oxidation parameters for aluminization coating.

In the present investigation, an attempt is made to produce high-quality aluminization coating by optimizing the cyclic oxidation parameters following a (L9-33) Taguchi-design approach.

(L9-33) Taguchi orthogonal array has been used to determine the signal to noise ratio (S / N).

The oxidation parameters that were varied include the Temperature (600, 700, 800 oC), Time (15,20,25hr at 5hr cycle) and Media (Air, CO2, H2O).

The coating characteristics were qualitified with respect to parabolic oxidation rate constant (KP).

The performance of the coating was qualitatively evaluated using cyclic oxidation testing.

Analysis of the experiments using Taguchi method indicated that 800 oC, 25hr and CO2 media are to be the optimum cyclic oxidation conditions for pack aluminization.

The contribution of each of these parameters to the parabolic oxidation rate constant (KP) was determined employing an analysis of variance (ANOVA) and the effect of the level of each parameter was determined using Taguchi analysis.

ANOVA results show that temperature and media are the parameters that most significantly affect the parabolic oxidation rate constant (KP) compared to time.