1. Nitriding nplhaib: Lub hardness ntawm nitrided txheej yog siab tshaj 950HV, lub brittleness yog qib 1, muaj zoo abrasion thiab corrosion kuj, siab zog qaug zog, ntau dua corrosion kuj thiab anti-tshuaj kev kawm; piston nplhaib deformation me me.
2. Chrome-plated nplhaib: chrome-plated txheej muaj zoo thiab du crystals, hardness yog siab tshaj 850HV, hnav kuj zoo heev, thiab crisscross micro-crack network yog qhov zoo rau khaws cia lubricants. Raws li cov ntaub ntawv tseem ceeb, "Tom qab chrome plating ntawm sab ntawm lub nplhaib piston zawj, hnav ntawm lub nplhaib zawj tuaj yeem txo qis. Ntawm cov cav nrog qhov nruab nrab kub thiab thauj khoom, cov txheej txheem hais saum toj no tuaj yeem txo qhov hnav ntawm piston nplhaib zawj los ntawm 33 txog 60 ".
3. Phosphating nplhaib: Los ntawm kev kho tshuaj, ib txheej ntawm phosphating zaj duab xis yog tsim nyob rau saum npoo ntawm lub nplhaib piston, uas tuaj yeem tiv thaiv cov khoom los ntawm xeb thiab txhim kho qhov pib khiav-hauv lub nplhaib.
4. Oxidation nplhaib: Nyob rau hauv qhov kub thiab txias thiab muaj zog oxidant, ib tug oxide zaj duab xis yog tsim nyob rau saum npoo ntawm cov khoom steel, uas muaj corrosion kuj, anti-kev sib txhuam lubrication thiab zoo tsos. Kuj tseem muaj PVD thiab lwm yam.
