Tharollo bakeng sa mathata a ho roala phofo holim'a metsi a chesang a chesang

1. Pheko e sa phethahalang:

• Polyester phofo ea ho roala Ke li-resin tsa thermosetting tse hokahanyang sebopeho sa tsona sa ho qetela ka ho bolokoa mocheso (ka tloaelo 180 o C), metsotso e ka bang 10. Li-ovens tsa ho folisa li etselitsoe ho fana ka nako ena ka motsoako oa mocheso. Ka lintho tse chesang tse entsoeng ka masenke, tse nang le botenya ba karolo e boima, hoa hlokahala ho netefatsa hore nako e lekaneng ea ho chesa e lumelloa ho finyella litlhaloso tsa pheko. Ho futhumatsa pele mosebetsi o boima ho tla thusa ho potlakisa ts'ebetso ea ho folisa ka ontong ea ho folisa.

2.Poor e khomarelang:

• Mokhahlelo oa ho qetela ts'ebetsong ea ho kenya metsi a chesang o kenyelletsa ho tima metsi a mosebetsi, hangata ka tharollo e fokolang ea sodium dichromate. Ts'ebetso ena e pholisa mosebetsi e le hore e ka sebetsanoa le ho feta holim'a lesela la masenke ho thibela oxidation ea pele ea bokaholimo. Ho ba teng ha filimi e pharalletseng holim'a lesela la masenke ho tla kena-kenana le pretreatment ea zinc phosphate kapa iron phosphate pretreatment, 'me maemong a mangata, ho etsa hore litlhare tsena tsa pele li se ke tsa sebetsa. Ho bohlokoa hore lintho tse entsoeng ka masenke a dip e chesang li se ke tsa tima ka mor'a ho belisoa. Sena se tiisa hore bokaholimo ba zinki bo boemong bo ts'oanelang haholo ho amohela ts'ebetso ea pele e sebelisitsoeng ts'ebetsong ea ho roala phofo.

3.Ho phunya:

• Pinholing e bakoa ke ho thehoa ha li-bubble tse nyenyane tsa khase ka har'a polyester e koahetsoeng nakong ea potoloho ea stoving / folisa. Li-bubble tsena li etsa li-craters tse nyenyane ka holim'a metsi 'me ha li shebahale hantle.Lebaka le ka sehloohong la ho pata pin le bonahala e le hore likaroloana tsa resin ea discrete polyester ha li kopane le bokaholimo ba tšepe ha li fuse ka nako e le 'ngoe le tse holim'a phofo ea polyester. filimi, ka lebaka la boima ba galvanized steel , le nako e nkiloeng hore e fihle mocheso oa motsoako.
• Li-resin tse entsoeng ka ho khetheha tse nang le 'degassing' agents li 'nile tsa ntlafatsoa ho fokotsa bothata bona ka ho liehisa ho qala ha motsoako oa phofo. Ho futhumatsa mosebetsi ka ontong ea pele ho mocheso pele ho ts'ebeliso ea phofo ho lumella likarolo tse boima tse chesang tsa dip hore li be le phofo 'me li sebetsane le bothata ba ho pata ha pin ha li sebelisoa hammoho le limaraka tsa "degassing" tsa polyester powder coating.