1. Chrome plating n'elu ka mma eyi iguzogide;
2. A na-eji chromium kpuchie oghere ndị na-adịghị mma iji melite nchekwa mmanụ elu ma na-agba ọsọ ọsọ;
3. Edebere n'elu ime ime ka ọ dịkwuo mma;
4. A na-enye oghere nchekwa mmanụ n'elu elu nke mgbanaka iji mee ka mmanu mmanu;
5. A na-eji ọla kọpa kpuchie elu elu nke mgbanaka ahụ iji kwado ịgba ọsọ;
6. A na-efesa molybdenum n'elu elu nke mgbanaka iji belata nrapado na iyi.

Achịkọtara dịka ndị a:
Melite nguzogide iyi: chrome plating, nitriding
Meziwanye arụmọrụ mbụ na-agba ọsọ: plating ọla kọpa, phosphating, sulfurizing
Iji gbochie iyi akwa: fesa molybdenum