The Percarbonate Stripping System for Thermal Spray (TS) Coatings

Stripping systems for thermal spray coatings tend to use many hazardous acids which  require critical safety procedures and produce heavy volumes of environmentally  unfriendly waste streams.  A new patented technology (filed under application numbers  2009/0120804A1.pdf and 2009/0229636A1.pdf) has been created using a very safe and  environmentally friendly percarbonate based chemical system with minimal DC rectified  voltage that safely strips many coatings such as WCCo and CrC-NiCr from substrates  such as Ti 6-4, IN718, Rene 41, and high strength steel.  Both plasma and HVOF  coatings can be stripped with this process in the pH 10-12 range.   The system can also be  combined with a refining system that purifies the waste water and condenses the coating  sludge into a condensed volume, eliminating the tremendous volume of waste  chemicals.  Case studies and actual stripping data will be presented and discussed.