MP (Mechanical polishing): jẹ lilo nigbagbogbo fun Layer ifoyina, awọn ihò, ati awọn imun lori oju awọn paipu irin. Imọlẹ ati ipa rẹ da lori iru ọna ṣiṣe. Ni afikun, polishing darí, biotilejepe lẹwa, tun le din ipata resistance. Nitorinaa, nigba lilo ni awọn agbegbe ibajẹ, itọju passivation nilo. Pẹlupẹlu, awọn iṣẹku ohun elo didan nigbagbogbo wa lori dada ti awọn paipu irin.