48. Txoj kev hnyav yog dab tsi? Lub hom phiaj ntawm kev siv cov kuab tshuaj yog dab tsi?

Tom qab cov kua qaub ntxuav thiab ntxuav, los yog tom qab immersion nyob rau hauv dilute hydrochloric acid tov ua ntej kub -dip galvanizing, steel kav yuav tsum xub coated nrog ib tug txheej ntawm concentrated hydrochloric acid, zinc chloride aqueous tov, ammonium chloride aqueous tov, los yog ib tug compound ntsev tov ntawm zinc chloride thiab ammonium chloride. Xwb, cov tshuaj ntsev sib xyaw tuaj yeem muab tso ncaj qha rau hauv lub thawv tshwj xeeb tsim rau ntawm zinc da dej nto, tso cai rau cov yeeb nkab kom dhau los ntawm molten compound ntsev txheej ua ntej nkag mus rau zinc da dej. Cov txheej txheem ntawm kev tsim cov kav dej galvanized steel siv ob txoj kev txheej txheej no yog hu ua cov txheej txheem hnyav. Cov qub hu ua "dry solvent method" los yog yooj yim "dry method," thaum lub sij hawm tom kawg yog hu ua "wt flux method" los yog yooj yim "wt method."
Lub hom phiaj ntawm kev siv cov kuab tshuaj yog los xyuas kom meej tias cov hlau matrix nyob rau saum npoo ntawm cov yeeb nkab steel tuaj yeem hnov ​​​​mob nrog zinc cov kua ib txwm nyob rau lub sijhawm luv luv thaum cov yeeb nkab steel yog immersed nyob rau hauv kub zinc kua, thiab tsim ib tug tiav hlau -zinc alloy txheej. Nyob rau hauv "txoj kev qhuav", cov kuab tshuaj zaj duab xis nyob rau saum npoo ntawm cov yeeb nkab steel tseem tuaj yeem tiv thaiv cov hlau matrix ntawm cov yeeb nkab steel los ntawm oxidized.