1. Cov tsos mob: Qhov saum npoo ntawm kub-dip galvanized square tubes yog me ntsis rougher piv rau pre galvanized square tubes; qhov saum npoo ntawm pre galvanized square tubes yog smoother thiab ci dua.
2. Zinc txheej thickness: Nws muaj qhov sib txawv tseem ceeb hauv cov txheej txheem galvanizing ntawm pre galvanized square tubes thiab kub-dip galvanized square tubes; lub angular npoo ntawm pre galvanized square raj yog nquag "hluav taws xob hlawv," uas ua rau ib tug tsaus grey xim thiab thicker zinc txheej. Nyob rau hauv cov cheeb tsam concave, tej zaum yuav muaj cov fab tuag ntawm cov dej ntws tam sim no ua rau cov cheeb tsam nrog cov zinc txheej nyias nyias, thiab cov phab ntsa sab hauv ntawm cov hlab ntsha txias-dip galvanized square tubes yuav tsis muaj zinc txheej. pre galvanized square tubes tsis muaj zinc hlav, clumping, tab sis tag nrho muaj ib tug nyias txheej zinc txheej, nrog zinc txheej thickness ntawm sab nrauv phab ntsa xws li 5μm mus rau 10μm. Kub-dip galvanized square tubes muaj zinc txheej ntawm ob sab hauv thiab sab nrauv phab ntsa, nrog rau cov dej ripples thiab qee cov zinc qog, tab sis tag nrho muaj cov zinc txheej tuab, nrog zinc txheej tuab ntawm cov phab ntsa sab hauv thiab sab nrauv ntawm lub raj square ntawm 70μm. los yog ntau dua.
3. Kev soj ntsuam xim: Thaum saib ntawm ib lub kaum ntse ntse nrog lub hnub ci, qhov txias-dip galvanized square tubes tshwm daj-ntsuab, cyan-dawb, lossis xim me ntsis. Kub-dip galvanized square raj tshwm nyiaj-dawb ntawm ib lub kaum ntse ntse nrog lub hnub ci.
