Experimental strategy : application of Taguchi's quality engineering method to zinc phosphate coating uniformity

Plating process quality can be improved at no additional cost or even at a saving by Taguchi's quality engineering approach. The experimental strategy described in this paper is different from traditional experimental design, in that it is concerned with reducing variance in the manufactured product by determining the best settings for the manufacturing process parameters without tightening tolerances on them. By employing dynamic characteristic statistics, a process for uniform zinc phosphate coating can be determined from the linear relationship between coating substrate geometric area (signal factor) and coating weight (output characteristic)