Author
Abstract
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 (600,700,800oC), 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 800oC,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.
Keywords
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