1. Cov kauj ruam txias dov:
Qhov saum npoo ntawm lub sawb muaj ob qhov tseem ceeb ntawm qhov roughness thiab residues.

2. Nto roughness:
Cold-dov strip nto roughness tswj txheej txheem uas muaj ntau yam, los ntawm batch annealing lub sawb, muaj ib tug tej yam nto roughness los txo cov nyhuv bonding defects.

3. Cov txheej txheem pickling:
Lub hom phiaj tseem ceeb yog tshem tawm cov txheej txheem ntawm cov txheej txheem kub-kuav los tiag hlau oxide, hlau oxide tshem tawm ntawm daim tawv nqaij piv kom tswj tau zoo, txhawm rau tswj kom zoo dua cov hlau oxide seem ntawm cov txheej txheem kub dov txawm tias yuav tsum tau kho.

4. Cov khaub thuas-kuav los tiag strip nto residues:
Lub hauv paus ntsiab lus ntawm kev ntxuav, mus rau hauv av ntxuav tus neeg saib xyuas wetting, soaked, qhwv stripping txheej txheem yuav tsum tau muab tshem tawm los ntawm steel nto. Lub luag haujlwm muaj zog ntawm cov polar molecules tsuas yog cuam tshuam rau cov txheej txheem ntxuav saum toj no, ua rau txo qis kev ua haujlwm.

Kub-dip galvanizing tshuab yog dav siv los tsim cov khoom zoo siab kub galvanized phaj, qhov saum npoo ntawm thawj pawg thawj coj saib xyuas zoo yog qhov tseem ceeb. Nrog cov tshuaj ntxuav, cov roj nplaum nplaum, hlau thiab lwm yam av raug tshem tawm. Tom qab ib tug zoo tu sawb, annealing zinc da dej yuav ua rau kom nws wetting muaj peev xwm kom tau zoo txheej txheej ntawm zinc.