1. Ring ea nitriding: Ho thatafala ha lera la nitrided ho ka holimo ho 950HV, brittleness ke grade 1, e na le ho senngoa ho hotle le ho hanyetsa ha kutu, matla a phahameng a mokhathala, khanyetso e phahameng ea kutu le ts'ebetso e khahlanong le ho tšoaroa; piston ring deformation e nyane.
2. Ring e entsoeng ka Chrome: Lera la chrome-plated le na le likristale tse ntle le tse boreleli, boima bo ka holimo ho 850HV, ho hanyetsa ho roala ho molemo haholo, 'me marang-rang a crisscross micro-crack a thusa ho boloka mafura. Ho latela tlhaiso-leseling e nepahetseng, "Kamora ho roala ha chrome ka lehlakoreng la ring groove ea piston, ho roala ha ring groove ho ka fokotseha haholo. Ho lienjine tse nang le mocheso o itekanetseng le mojaro, mekhoa e boletsoeng ka holimo e ka fokotsa ho roala ha piston ring groove ka 33 ho isa ho 60”.
3. Lesale la Phosphating: Ka phekolo ea lik'hemik'hale, lesela la filimi ea phosphating le hlahisoa ka holim'a lesale la piston, le ka thibelang sehlahisoa hore se se ke sa rusa le ho ntlafatsa ts'ebetso ea pele ea lesale.
4. Lesale la oxidation: Tlas'a boemo ba mocheso o phahameng le oxidant e matla, filimi ea oxide e thehoa holim'a thepa ea tšepe, e nang le khanyetso ea kutu, lubrication e khahlanong le friction le ponahalo e ntle. Ho boetse ho na le PVD joalo-joalo.
