I-Phosphating Conversion Coatings

Ukwelashwa kwangaphambili okwaziwayo kwama-substrates ensimbi ngaphambi nje kokusetshenziswa i-powder coatings i-phosphating engahluka ngesisindo sokugqoka.

Uma sikhulu isisindo sokuguqula ukuguqulwa sikhulu izinga lokumelana nokugqwala elizuziwe; ephansi isisindo enamathela ngcono izakhiwo mechanical. Ngakho-ke kuyadingeka ukukhetha ukuvumelana phakathi kwezakhiwo zemishini kanye nokumelana nokugqwala. Izisindo eziphezulu zokumboza i-phosphate zingadala inkinga ngezimbobo zempushana lapho ukuphuka kwekristalu kungenzeka lapho ukunamathela kungaphansi kwamandla emishini asetshenziswa endaweni, isb. ukugoba noma umthelela.

Ngenxa yokunamathela okuhle kakhulu koqweqwe lwempushana embotsheni ye-phosphate, ukuhlakazwa kuzovame ukwenzeka endaweni esibonakalayo ye-phosphate/metal substrate kunasekuhlanganiseni kwe-phosphate/powder.

Izembatho ze-phosphate zimbozwe yi-BS3189/1959, i-Class C ye-zinc phosphate kanye ne-Class D ye-iron phosphate.
I-fine crystalline zinc phosphate iyanconywa ekuhlanganisweni kwesisindo esingu-1-2g/m2 kanye ne-iron phosphate ku-0.3-1g/m2. Isicelo singenziwa ngesifutho noma ngokucwiliswa. Ukudlula i-Chromate ngokuvamile akudingekile.
I-Zinc phosphate ingaba isifutho noma idiphu ifakwe ekusebenzeni kwezigaba ezinhlanu, okungukuthi. i-alkali degrease, hlambulula, i-zinc phosphate, ama-rinse amabili amanzi.

Izindwangu ze-iron phosphate ngokuvamile zifafazwa ekusebenzeni kwezigaba ezintathu noma ezine. Umsebenzi uvame ukudlula ezingxenyeni ezimbili zokuhlanza amanzi ngaphambi kokoma.
Kubalulekile ukuthi i-workpiece ngemuva kwe-phosphating ifakwe impushana ngokushesha ngangokunokwenzeka ngemva kokumiswa.