1. Nitriding mowhiti: Ko te pakeke o te paparanga nitrided kei runga ake i te 950HV, ko te pakaruhanga ko te karaehe 1, he pai te abrasion me te parenga waikura, teitei ake te kaha o te ngenge, teitei ake te aukati me te mahi anti-seizure; iti whakakino mowhiti piston.
2. Te whakakikorua Chrome: Ko te paparanga chrome-whakakikorua he tioata pai me te maeneene, ko te pakeke kei runga ake i te 850HV, he tino pai te aukati o te kakahu, me te whatunga moroiti-crack crisscross he pai ki te penapena hinu. E ai ki nga korero e tika ana, "I muri i te whakakikorua chrome i te taha o te riipene mowhiti piston, ka tino heke te kakahu o te riu mowhiti. I runga i nga miihini me te ngawari o te pāmahana me te utaina, ka taea e nga tikanga kua whakahuahia i runga ake nei te whakaheke i te kakahu o te riipene mowhiti piston ma te 33 ki te 60".
3. Te mowhiti Phosphating: Na roto i te maimoatanga matū, ka hangaia he paparanga o te kiriata phosphating i runga i te mata o te mowhiti piston, ka taea te aukati i te hua mai i te waikura me te whakapai ake i te rere tuatahi o te mowhiti.
4. Te mowhiti oxidation: I raro i te ahua o te teitei o te wera me te kaha o te waikura, ka hangaia he kiriata waikura i runga i te mata o te mea rino, he parenga waikura, he whakahinuhinu anti-friction me te ahua pai. He PVD ano me etahi atu.
