Iibholiti ze-Hex ze-Dacromet-Coated

2026-10-27

1. Intshayelelo

Iibholiti zeHex (ihexagon head bolts) ziphakathi kwezona ziqhoboshi zisetyenziswa kakhulu kulwakhiwo, koomatshini, kwindibano yeemoto, nakwiziseko ezingundoqo. Kwiindawo ezinobungozi - izakhiwo zonxweme, izityalo zamachiza, iindlela ezihamba phambili, iibhuloho, kunye neenqaba zensimbi zangaphandle - ubomi benkonzo ye-bolted joint bolt kaninzi bumiselwa kungekhona ngamandla ensimbi, kodwa ngokuhlala kwengubo yokukhusela.

I-Dacromet yokugqoka (eyaziwa nangokuthi i-DACROMET, i-Dacromet ye-zinc-flake coating, okanye i-zinc-aluminium flake coating) i-conversion-based-conversion-and-barrier coating esetyenziswe nge-dip-spin okanye iinkqubo zokutshiza kwaye iphiliswe kwiqondo lokushisa eliphantsi. Ukusukela ekuvelisweni kwayo e-United States ngeminyaka yoo-1970 kunye noshishino olwalandelayo eJapan naseYurophu, i-Dacromet iye yaba sisisombululo esiqhelekileyo sokhuselo lwe-corrosion kwi-bolts-high-power bolts, ngakumbi kumabakala 8.8 nangaphezulu, apho i-galvanizing yemveli eshushu-dip ithwala imingcipheko ye-hydrogen embrittlement kunye neengxaki zobukhulu.

2. Yintoni i-Dacromet-Coated Hex Bolt?

Ibholiti ye-hex egqunywe nge-Dacromet yi-hexagon head bolt eqhelekileyo (ngokwe-ISO 4014 / ISO 4017 / DIN 931 / DIN 933 okanye i-ASME B18.2.1) umphezulu wayo ukhuselwe yi-zinc-flake esekelwe kwi-coating esetyenziswe kwi-slurry esekwe emanzini equlethe:

Iiflakes ze-zinc kunye ne-aluminium flakes- umqobo osebenzayo wokukhusela i-corrosion (umlinganiselo oqhelekileyo malunga ne-75% Zn / 25% Al ngomxholo oqinileyo);
Iikhompawundi zeChromium okanye iipasvators ezingena-chromium- ukubonelela ngokuziphilisa kwindawo yokuqala;
Izibophelelo ze-Inorganic kunye ne-cellulose thickeners- zibophe iiflakes kwifilimu edibeneyo, ehambelanayo;
Amanzi adibeneyo— indlela ephathwayo, eyenza inkqubo ingabi ne-VOC kwaye ihambelane nokusingqongileyo.

Ukugquma kusetyenziswa ngokudipha (okanye ukutshiza) kulandele i-centrifugal spinning ukususa i-slurry engaphezulu, kwaye iphiliswe malunga ne-280-330 ° C malunga nemizuzu engama-20-40. Imijikelo yedip-spin emininzi (ngokuqhelekileyo emibini) yakha ubukhulu be-coating ye-6-10 μm; iiklasi ezinzima zifikelela kwi-12-15 μm.

Iimpawu eziphambili zeNkqubo yeDacromet

Uphawu	Inkcazo
Ukunyanga ubushushu	280–330°C (ngaphantsi kobushushu bobushushu bebakala 10.9/12.9 iibholiti)
Ubunzima bokugquma	6–15 μm (ixhomekeke kwiklasi), ibhityile kakhulu kune-galvanizing yediphu eshushu (45–85 μm)
I-hydrogen embrittlement	Akukho pickling acid, akukho electroplating - phantse akukho hydrogen embrittlement ingozi
Hex intloko ilingana	Ibhityile, iyunifomu yokwambathisa igcina intambo yejometri - iibholithi zidibana neetephu eziqhelekileyo kunye namandongomane
Inkangeleko yendalo esingqongileyo	Amanzi, akukho kukhutshwa kwe-VOC; I-chromium-free (Cr³⁺/Cr⁶⁺-free) iintlobo ngeentlobo ziyafumaneka
Ukuqhuba kombane	Ifilimu eqhubayo, ifanelekile kwizakhiwo ezisisiseko-ezibalulekileyo

Itheyibhile 1. Iimpawu eziphambili zenkqubo yokugqoka iDacromet.

3. Inkqubo yoKhuseleko loMhlwa

I-Dacromet ikhusela i-substrate yentsimbi ngokusebenzisa iindlela ezintathu ezongezelelweyo:

1.Isiphumo sesithintelo- i-zinc edibeneyo kunye ne-aluminium flakes zenza ifilimu ene-laminated ene-tortuous path eyenza ngokukhawuleza ukungena kwamanzi, i-oksijeni, kunye ne-chloride ion.

2.Ukukhuselwa kwedini- i-zinc ihloniphekile kunentsimbi; nakweyiphi na i-scratch okanye i-cut edge, i-zinc corrodes ngokukhethekileyo kwaye ikhusela i-cathodically intsimbi eveziweyo.

3.Ukuziphilisa/ukuziphilisa- ii-passivators zenza iifilimu ze-insoluble oxide kwiindawo ezonakalisiweyo, "ukuphilisa" imikrwelo emincinci kunye nokulibazisa i-rust emhlophe kunye nokwakheka komhlwa obomvu.

Ukudityaniswa kwezi ndlela zintathu kuchaza ukuba kutheni i-Dacromet yokwambathisa ihlala ihambisa iiyure ezingama-500-1,000 kwiruhlwa ebomvu kuvavanyo lokutshiza ityuwa engathathi hlangothi (nge-ISO 9227 / ASTM B117) kubunzima be-6-10 μm kuphela - amaxesha amaninzi ukusebenza kokulingana-ukutyeba kwe-electro-galvanizing.

4. Ukuqukumbela

I-Dacromet-coated hex bolts idibanisa amandla omatshini kwiiklasi eziqhelekileyo zepropathi 8.8-12.9 kunye ne-thin, uniform, i-hydrogen-ekhuselekileyo, kunye nenkqubo yokukhusela i-corrosion-protection. Ngokusebenza kwesitshizi setyuwa amaxesha amaninzi ngcono kune-electro-galvanizing kwiqhezu lobunzima be-hot-dip galvanizing, i-Dacromet iye yaba luphawu olungagqibekanga lwezibophelelo zokuqina okuphezulu kwiziseko ezingundoqo ezifunwayo, amandla, kunye neeprojekthi zothutho.

Kubathengi kunye neenjineli, ezona zigqibo ziphambili ludidi lokugquma (ukutyeba kunye neeyure ze-NSS), uhlobo lwechromate (Cr³⁺ vs Cr-free), ulawulo lwe-friction coefficient, kunye nokuthotyelwa kwe-ISO 10683 / ASTM F1136. I-Dacromet hex bolt echazwe ngokufanelekileyo inikezela ngokuqikelelwayo, ingqibelelo edibeneyo yexesha elide - nakwimimandla enzima kakhulu.

Andinayo. Okulandelayo.

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