Die Castings pose some of the most challenging
problems in anodizing. This paper
provides some explanations by tying together metallurgical science with
anodizing practice.
Die castings pose some of the most challenging
problems in anodizing. The finish can be too thin, non-uniform and/or
have an unfavorable appearance. These are common problems with a variety
of practical solutions; they are easy to recognize, but in many instances, the
source for the problem remains unknown. Critical to solving the problems
of anodizing die castings is understanding the die cast substrate and the
impact of surface condition, alloy composition, casting quality and
microstructure on the anodizing process. Substrate quality issues are just as
important, maybe more so, than anodizing conditions and technique.
Certain optimum anodizing conditions may be used in some cases to help overcome
less than advantageous metallurgical conditions. These include well known
processing tools such as various pretreatment chemistries, higher anodizing
bath concentration, and higher bath temperatures. These, and other recommended
solutions are not successful in every case; sometimes trial and error testing on
actual production parts must be done to find the best processing
techniques. Through the use of actual case studies that provide real-life
solutions in terms of anodizing theory and interfacial science, this paper
provides some explanations by tying together metallurgical science with
anodizing practice.
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Finishing Magazine click
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