Common Surface Treatments Rau Bolts

Txheej: thov ib txheej rau saum npoo ntawm lub ntsia liaj qhov rooj los tsim cov yeeb yaj kiab zoo sib xws uas txhim kho nws cov kev tiv thaiv corrosion thiab zoo li. Qhov zoo dua yog tias nws zoo nkaus li zoo, tab sis qhov tsis zoo yog tias nws tsis ruaj khov thiab yooj yim khawb.
Kub-dip galvanizing: immersing lub ntsia liaj qhov rooj nyob rau hauv molten zinc los txhim kho nws corrosion kuj. Qhov zoo dua yog tias nws muaj peev xwm tiv thaiv corrosion thiab tsis yooj yim rau poob, tab sis qhov tsis zoo yog qhov saum npoo tsis zoo nkauj txaus.
Electroplating: immersing lub ntsia liaj qhov rooj nyob rau hauv ib tug electrolyte thiab depositing ib txheej ntawm hlau nyob rau saum npoo ntawm lub ntsia liaj qhov rooj los ntawm electrolysis los txhim kho nws corrosion kuj thiab zoo li.. Qhov zoo dua yog qhov saum npoo yog du thiab zoo nkauj, tab sis qhov tsis zoo yog tias nws yooj yim rau hydrogen embrittlement.
Dacro: immersing cov bolts rau hauv zinc-aluminium tov, xyuas kom meej tias lub bolt yog tag nrho nyob rau hauv kev sib cuag nrog cov tshuaj ua ntej chais tawm cov tshuaj ntau dhau thiab ziab nws. Rov ua cov txheej txheem saum toj no 2-4 sij hawm los tsim ib zaj duab xis ntom ntom ntawm qhov ntsia hlau, ua tiav cov nyhuv ntawm anticorrosion. Qhov zoo ntawm cov txheej txheem no yog qhov saum npoo zoo nkauj thiab tsis yooj yim rau poob, tab sis qhov tsis zoo yog tias nws tsis ruaj khov thiab yooj yim khawb. Tam sim no muaj ib tug hexavalent chromium-dawb mis, uas yog ntau tus phooj ywg environmentally.