Hex Bolts mai rufi dacromet 

1. Gabatarwa

Hex bolts (kusan hexagon head bolts) suna daga cikin abubuwan haɗin da aka fi amfani da su a cikin gine-gine, injina, haɗar motoci, da ababen more rayuwa. A cikin mahalli masu lalata - sifofin bakin teku, tsire-tsire masu sinadarai, manyan hanyoyi, gadoji, da hasumiya na ƙarfe na waje - rayuwar sabis na haɗin gwiwa da aka kulle galibi ana ƙaddara ba ta ƙarfin ƙarfe ba, amma ta dorewar murfin kariya.

Dacromet shafi (wanda kuma aka sani da DACROMET, Dacromet zinc-flake shafi, ko zinc-aluminum flake shafi) shafi ne na tushen ruwa-da-shamaki da aka yi amfani da shi ta hanyar tsoma-spin ko tsarin fesa kuma an warke a ƙananan zafin jiki. Tun da aka ƙirƙira shi a Amurka a cikin 1970s da haɓakar masana'antu na gaba a Japan da Turai, Dacromet ya zama babban maganin lalata-kariya don manyan kusoshi, musamman a maki 8.8 da sama, inda galvanizing mai zafi na al'ada ke ɗaukar haɗarin haɓakar hydrogen da matsalolin girma.

2. Menene Hex Bolt Mai Rufe Dacromet?

Dacromet mai rufaffen hex bolt shine daidaitaccen kwandon hexagon kai (a kowace ISO 4014 / ISO 4017 / DIN 931 / DIN 933 ko ASME B18.2.1) wanda samansa ya sami kariya ta rufin tutiya-flake da aka yi amfani da shi daga slurry na tushen ruwa wanda ya ƙunshi:

• Zinc flakes da aluminum flakes- shingen kariya mai aiki mai aiki (rabo na yau da kullun a kusa da 75% Zn / 25% Al ta ingantaccen abun ciki);
• Haɗin chromium ko masu wucewa marasa chromium- samar da kai-warkar da passivation a karce yankunan;
• Inorganic binders da cellulose thickeners- haɗa flakes a cikin fim mai yawa, mai ma'ana;
• Deionized ruwa- matsakaicin ɗaukar nauyi, yin tsarin ba tare da VOC ba kuma yana da alaƙa da muhalli.

Ana amfani da murfin ta hanyar tsoma (ko fesa) sannan a bi da juzu'i na centrifugal don cire slurry mai yawa, sannan a warke a kusan 280-330 ° C na mintuna 20-40. Matsakaicin tsalle-tsalle masu yawa (yawanci biyu) suna gina kauri na 6-10 μm; azuzuwan nauyi sun kai 12-15 μm.