Coatings can protect against corrosion
Corrosion test during extrusion
High performance polyamides are processed at high temperatures (> 300°C) and often are processed with non-halogenated flame retardants and glass fibers. The impact of wear and corrosion can be measured dynamically on a special testing device. The polymer was processed through the test tool inserts and the weight loss was measured after processing each 25 kg of the melt.
Non-coated steel inserts
After 25 kg processed compound the inserts had suffered a considerable weight loss due to corrosive attack.
Inserts coated with 5 different sputter coatings from CemeCon
After 100 kg processed compound no optical changes are seen, and no weight loss could be measured on any of the coated inserts.
