Dry-in-place conversion coatings creating excitement in finishing—part II
This is the second part of a two-part article on pretreatment advancements in dry-in-place (DIP), non- or low-phosphate conversion coating. Part I, published in September 2006, introduced this emerging technology by explaining its history, benefits, and the background leading to several North American installations by the industry's chemical leaders. Part II describes and summarizes the results of salt-spray testing of 600 panels pretreated with several of these DIP materials and then powder coated and cured. The article explains what the potential limitations of these new materials are and what the finisher should do to thoroughly test this technology before implementation into an existing line.
The goal of this two-part article is to introduce and educate potential users of dry-in-place (DIP), non- or low-phosphate conversion coatings. Part I explained the various types or chemical DIP families in use and discussed their advantages. The article also described a salt-spray test conducted with the use of various DIP materials from several chemical companies. This article shows the results of the salt-spray test and offers information on how to properly evaluate or test DIP materials if you're interested in using them in your powder coating operations. As stated in part I, the goal of the series is to evaluate this emerging technology in as close to a production setting as possible.