1. Kev tshwm sim:
Qhov saum npoo ntawm cov khoom tsis raug tso cai kom muaj cov xim hauv zos uas tsis yog txheej, hlawv, ntxhib, tsaus, tev, crusting thiab pom tseeb streaks, thiab pinhole pitting, dub slag, xoob passivation zaj duab xis, tawg, tev thiab puas tsuaj loj. Passivation cov cim.
2. Txheej thickness:
Lub neej ua haujlwm ntawm lub fastener nyob rau hauv ib qho chaw corrosive yog proportional rau nws txheej thickness. Feem ntau, qhov pom zoo thickness ntawm cov khoom siv electroplating txheej yog 0.00015in-0.0005in (4-12um). Kub-dip galvanizing: Tus qauv nruab nrab thickness yog 54 um (43 um rau lub nominal txoj kab uas hla Tsawg dua los yog sib npaug rau 3/8), thiab qhov tsawg kawg nkaus thickness yog 43 um (37 um rau lub nominal txoj kab uas hla tsawg dua los yog sib npaug rau 3/ 8).
3. Txheej faib:
Nyob ntawm txoj kev deposition, lub plating accumulates ntawm lub fastener nto nyob rau hauv ntau txoj kev. Thaum lub sij hawm electroplating, cov hlau plating tsis sib npaug rau ntawm ntug peripheral, thiab cov plating tuab yog tau ntawm cov ces kaum. Nyob rau hauv lub threaded ib feem ntawm fastener, lub thickest txheej yog nyob rau sab saum toj ntawm cov xov, maj mam thinner nyob rau sab ntawm cov xov, thiab lub thinnest yog tso rau hauv qab ntawm cov hniav, thaum kub-dip galvanizing yog qhov opposite, thicker coatings yog tso rau ntawm sab hauv ces kaum thiab nyob rau hauv qab ntawm cov xov, mechanically plated plated hlau deposits yuav zoo ib yam li kub dip plated, tab sis yog smoother thiab ntau npaum li cas uniform nyob rau hauv thickness tshaj tag nrho cov nto.
4. Hydrogen embrittlement:
Thaum lub sij hawm ua thiab tuav cov fasteners, tshwj xeeb tshaj yog nyob rau hauv lub pickling thiab alkaline tu ua ntej plating thiab tom qab electroplating txheej txheem, lub nto absorbs hydrogen atoms, thiab cov deposited hlau txheej ces captures hydrogen. Raws li lub fastener yog nruj, cov hydrogen migrate mus rau cov cheeb tsam ntawm cov kev nyuaj siab loj tshaj plaws concentration, ua rau cov kev nyuaj siab nce tshaj lub zog ntawm lub hauv paus hlau thiab tsim microscopic nto tawg. Hydrogen yog tshwj xeeb tshaj yog mobile thiab sai sai nkag mus rau hauv tshiab tsim fissures. Lub voj voog siab-rupture-infiltration no txuas ntxiv mus txog thaum lub fastener ua tsis tiav. Feem ntau tshwm sim hauv ob peb teev ntawm thawj daim ntawv thov kev ntxhov siab. Txhawm rau tshem tawm qhov kev hem thawj ntawm hydrogen embrittlement, fasteners tau kub kom sai li sai tau tom qab plating kom tso hydrogen los ntawm plating, feem ntau ntawm 375-4000F (176-190 degree) rau 3-24 teev .
5. Adhesion:
Slice los yog pry nrog lub taub hau thiab txiav txim siab siab. Adhesion yuav tsum tau txiav txim siab tsis txaus yog tias, nyob rau hauv pem hauv ntej ntawm lub ntsis, lub txheej flakes tawm nyob rau hauv daim ntawv ntawm flakes los yog tawv nqaij, exposing lub hauv paus hlau.
