Letlapa la tšepe le entsoeng ka tšepe ke poleiti ea tšepe e cheselitsoeng e nang le li-dip tse chesang kapa tse entsoeng ka electro galvanized holim'a metsi, tse sebelisoang haholo kahong, lisebelisoa tsa ntlo, likoloi le likepe, tlhahiso ea lijana, indasteri ea electromechanical, joalo-joalo.
Nts'etsopele ea tlhahiso ea li-galvanizing tsa hot dip naheng ea China e ntse e salletse morao.Ho tloha lilemong tsa bo-1950 ho isa lilemong tsa bo-1960, ho ile ha hahoa likarolo tse 13 tsa hot-dip galvanizing bakeng sa lipoleiti tsa tšepe tsa lakane e le 'ngoe, tse nang le matla a 100000 t / A. Leha ho le joalo, ka lebaka la bofokoli ba tlhahiso e tlaase, theko e phahameng, boleng bo tlaase, tšilafalo ea tikoloho, bofokoli. melemo ea moruo joalo-joalo, li emisitsoe le ho fetoloa tlhahiso.Ho tloha bofelong ba lilemo tsa bo-1970, Chaena e ile ea qala ho haha lisebelisoa tse kholo tsa marang-rang tse futhumatsang metsi.