1. Indandatho ye-nitriding: Ukuqina kongqimba lwe-nitrided kungaphezu kuka-950HV, i-brittleness iyibanga loku-1, inokumelana nokuhuzuka nokugqwala okuhle, amandla aphakeme okukhathala, ukumelana nokugqwala okuphezulu kanye nokusebenza kokulwa nokuthunjwa; piston ring deformation encane.
2. Iringi ye-Chrome-plated: Isendlalelo se-chrome-plated sinamakristalu amahle futhi abushelelezi, ubulukhuni bungaphezu kuka-850HV, ukumelana nokugqokwa kuhle kakhulu, futhi inethiwekhi ye-crisscross micro-crack ivumela ukugcina izinto zokugcoba. Ngokusho kolwazi olufanele, "Ngemuva kokucwecwa kwe-chrome ohlangothini lwe-piston ring groove, ukuguga kwe-ring groove kungancipha kakhulu. Ezinjinini ezinokushisa okumaphakathi nomthwalo, lezi zindlela ezibalwe ngenhla zinganciphisa ukuguga kwe-piston ring groove ngo-33 kuya ku-60”.
3. I-Phosphating ring: Ngokwelashwa ngamakhemikhali, ungqimba lwefilimu ye-phosphating lukhiqizwa phezu kweringi ye-piston, engavimbela umkhiqizo ukuthi ungagqwali futhi uthuthukise ukugijima kokuqala kweringi.
4. Indandatho ye-oxidation: Ngaphansi kwesimo sokushisa okuphezulu kanye ne-oxidant enamandla, ifilimu ye-oxide yakheka ebusweni bensimbi, enokumelana nokugqwala, ukuthambisa okulwa nokungqubuzana nokubukeka kahle. Kukhona futhi i-PVD nokunye.
