Pretreatment imaphatikizapo njira zophweka ndi njira zodzipangira nokha, zotsirizirazo zimagawidwanso kukhala kupopera mbewu mankhwalawa ndi kupopera mbewu mankhwalawa. Pamaso ❖ kuyanika ufa, workpieces ayenera kukumana pamwamba mankhwala kuchotsa mafuta ndi dzimbiri. Gawoli limagwiritsa ntchito mankhwala osiyanasiyana, makamaka ochotsa dzimbiri, ochotsera dzimbiri, zowongolera pamwamba, ndi ma phosphating agents.
Mu gawo la pretreatment kapena msonkhano wa mzere wopangira zokutira, choyambirira choyamba ndikukhazikitsa njira zofunika zogulira, zoyendetsa, zosungira, ndikugwiritsa ntchito ma acid amphamvu ndi alkali; patsa ogwira ntchito zovala zodzitetezera; onetsetsani zotengera zotetezeka komanso zodalirika, zogwirira ntchito, ndi zida; ndikukhazikitsa njira zoyankhira mwadzidzidzi ndi njira zopulumutsira pakachitika ngozi. Kachiwiri, chifukwa gawo lokonzekera bwino la mzere wopangira zokutira limatulutsa kuchuluka kwa gasi wotayidwa ndi zinyalala zamadzimadzi, njira zotetezera chilengedwe ziyenera kuphatikiza utsi, ngalande, ndi zida zotayira zinyalala.
Ubwino wa workpieces pretreated amasiyana chifukwa cha kusiyana kwa njira zopangira mankhwala komanso njira zopangira zokutira. Pazigawo zogwiritsidwa ntchito bwino-zochotsa mafuta ndi dzimbiri, mankhwala a phosphating kapena passivation nthawi zambiri amachitidwa kangapo pambuyo pokonza kuti zisachite dzimbirinso pakanthawi kochepa. Pamaso ❖ kuyanika ufa, workpieces phosphated ayenera zouma kuchotsa pamwamba chinyezi. Nthawi zambiri amagwiritsa ntchito-timagulu tating'onoting'ono,-pang'onoting'ono, kuyanika mpweya wachilengedwe, kuyanika ndi dzuwa, kapena kuyanika ndi mphepo. Popanga zazikulu-zopanga zingwe, zowumitsa pang'ono{8}}zotentha nthawi zambiri zimagwiritsidwa ntchito pogwiritsa ntchito ma uvuni kapena zowumitsa.
