Dacromet-Coated Hex Bolts 

1. Taw qhia

Hex bolts (hexagon taub hau ntsia liaj qhov rooj) yog cov feem ntau siv fasteners nyob rau hauv kev tsim kho, machinery, tsheb sib dhos, thiab infrastructure. Nyob rau hauv ib puag ncig corrosive - ntug hiav txwv qauv, tshuaj nroj tsuag, txoj kev loj, txuas hniav, thiab sab nraum zoov steel yees - kev pab cuam lub neej ntawm ib tug bolted sib koom feem ntau txiav txim tsis yog los ntawm lub zog ntawm cov hlau, tab sis los ntawm lub durability ntawm nws cov txheej tiv thaiv.

Dacromet txheej (tseem hu ua DACROMET, Dacromet zinc-flake txheej, lossis zinc-aluminium flake txheej) yog dej-raws li kev hloov pauv-thiab-txheej txheej txheej siv los ntawm dip-spin los yog cov txheej txheem tshuaj tsuag thiab kho ntawm qhov kub thiab txias. Txij li thaum nws tsim nyob rau hauv lub tebchaws United States nyob rau hauv lub xyoo 1970s thiab nws cov tom ntej industrialization nyob rau hauv Nyiv thiab Europe, Dacromet tau dhau los ua lub ntsiab corrosion-tiv thaiv kev daws teeb meem rau high-strength bolts, tshwj xeeb tshaj yog nyob rau hauv qib 8.8 thiab siab dua, qhov twg cov tsoos kub-dip galvanizing yog hydrogen embrittlement txaus ntshai thiab cov teeb meem seem.

2. Dab tsi yog Dacromet-Coated Hex Bolt?

Dacromet-coated hex bolt yog tus qauv hexagon taub hau ntsia liaj qhov rooj (ib ISO 4014 / ISO 4017 / DIN 931 / DIN 933 lossis ASME B18.2.1) uas nws nto tau tiv thaiv los ntawm zinc-flake raws txheej siv los ntawm cov dej-raws li slurry uas muaj:

• Zinc flakes thiab aluminium flakes- lub active corrosion-tiv thaiv barrier (tus piv ntawm ib ncig ntawm 75% Zn / 25% Al los ntawm cov ntsiab lus khoom);
• Chromium compounds los yog chromium-free passivators- muab kev kho tus kheej passivation ntawm qhov chaw khawb;
• Inorganic binders thiab cellulose thickeners- khi cov flakes mus rau hauv ib tug ntom, adherent zaj duab xis;
• Deionized dej- qhov nruab nrab nqa, ua cov txheej txheem VOC-dawb thiab ib puag ncig tus phooj ywg.

Cov txheej yog siv los ntawm dipping (los yog txau) ua raws li centrifugal spinning kom tshem tawm cov slurry tshaj, tom qab ntawd kho ntawm kwv yees li 280-330 ° C rau 20-40 feeb. Ntau lub voj voog dip-spin (feem ntau yog ob) tsim cov txheej tuab ntawm 6-10 μm; Cov chav kawm hnyav nce mus txog 12-15 μm.