Qhov sib txawv ntawm Xim Zinc thiab Dawb / Xiav Zinc Plating
Zinc plating yog ib qho ntawm cov kev tiv thaiv saum npoo uas siv ntau tshaj plaws rau cov hlau ferrous, muab kev tiv thaiv corrosion los ntawm kev ua galvanic. Tom qab electroplating, zinc txheej yuav luag txhua zauschromate conversion kev kho mob(passivation), uas tsim cov tshuaj tiv thaiv zaj duab xis uas ua kom muaj zog tiv thaiv corrosion. Qhov pom kev sib txawv ntawm "xim zinc" thiab "dawb / xiav zinc" tshwm sim los ntawm cov qauv chromate sib txawv, uas ua rau muaj qhov sib txawv ntawm kev ua tau zoo thiab kev siv.
1. Kev Pom Zoo
表格
| Yam ntxwv | Xim Zinc (Daj / Zaj sawv) | Dawb / Xiav Zinc (Ntshiab) |
|---|---|---|
| Xim | Iridescent daj, golden, ntsuab - daj, los yog zaj sawv tsos | Silvery-dawb, ci xim hlau, lossis faint bluish tint |
| Zaj duab xis thickness | Thicker (feem ntau 200-500 nm) | Thinner (feem ntau 50-150 nm) |
| Nto kev ntxhib los mos | Me ntsis matte rau satin; tuaj yeem pom crystalline iridescence | Bright, reflective, ze rau liab qab zinc luster |
2. Tshuaj muaj pes tsawg leeg
Xim Zinc (Daj Chromate)
Raws lihexavalent chromium(Cr⁶⁺) chemistry ib txwm muaj, txawm hais tias trivalent chromium (Cr³⁺) lwm txoj kev tam sim no muaj ntau.
Muaj chromic acid, sulfuric acid, nitric acid, thiab qee zaum hydrochloric acid
Siab siab ntawm chromate ntsev nyob rau hauv cov tshuaj hloov dua siab tshiab
Tej zaum muaj xws li dyes los yog pigments los ua kom cov tsos daj
Dawb / Xiav Zinc (Clear Chromate / Xiav -Caj chromate)
Txo cov chromate concentration hauv lub da dej hloov dua siab tshiab
Feem ntau suav nrogorganic brightenerslos yogMolybdate / silicate additives
Trivalent chromium-raws li formulations dominates niaj hnub siv
Qee cov qauv muaj xws li cov kab mob organic dyes los tsim cov xim xiav faint (li no "blue zinc")
3. Corrosion Resistance Performance
表格
| Parameter | Xim Zinc | Dawb / Xiav Zinc |
|---|---|---|
| Neutral ntsev tsuag (NSS) tsis kam | 48-96 teev rau dawb xeb; 200+ teev rau lub hauv paus hlau corrosion (rau hexavalent systems) | 24-48 xuab moos rau dawb xeb; 72-120 teev rau lub hauv paus hlau |
| Trivalent Cr sib npaug | 72-120 teev dawb xeb | 24-48 teev dawb xeb |
| Zaj duab xis tus kheej- kho | Superior; thicker zaj duab xis muab kev tiv thaiv zoo dua | Nruab nrab; thinner zaj duab xis muaj peev xwm kho tau tsawg |
| Thermal stability | Zoo dua; withstands 100-150℃tsis muaj degradation tseem ceeb | qis; tej zaum yuav tsis muaj xim los yog poob kev tiv thaiv saum 80-100 degree |
4. Kev ua haujlwm thiab cov cuab yeej cuab tam
表格
| Khoom | Xim Zinc | Dawb / Xiav Zinc |
|---|---|---|
| Hluav taws xob conductivity | qis; thicker insulating chromate txheej | Siab dua; thinner zaj duab xis tuav zoo dua conductivity |
| Torque-kev sib raug zoo | Zoo sib xws; lubricating zog ntawm tuab zaj duab xis txo scatter | Kev sib txhuam siab dua; xav tau kev tswj torque ntau dua |
| Xim adhesion | Yuav tsum tau ua kom nto los yog primer tshwj xeeb vim lub zog nto qis | Zoo dua; thinner zaj duab xis khaws cov khoom sib txuas ntawm cov hlau |
| Hydrogen embrittlement txaus ntshai | Zoo sib xws cov kev pheej hmoo, tab sis cov zaj duab xis tuab tuaj yeem npog qhov kev tshawb pom ntxov | Cov nyhuv npog qhov qis; txhawb kev soj ntsuam embrittlement |
5. Daim ntawv thov npe
Xim Zinc Nyiam Rau:
Sab nraum zoov thiab hnyav ib puag ncig daim ntaub ntawv (automotive underbody, tsim fasteners, ua liaj ua teb machinery)
Tub rog thiab aerospace hardware xav tau kev tiv thaiv corrosion siab tshaj plaws
Cheebtsam nrog ncua kev pab cuam lub neej yuav tsum tsis muaj txij nkawm
Daim ntawv thov qhov kev sib txawv ntawm qhov zoo li qhia txog qib kev kho mob
Kev lag luam tsoos uas tseem tso cai rau hexavalent chromium (tsawg vim RoHS / REACH cov cai)
Dawb / Xiav Zinc Nyiam Rau:
Kev siv sab hauv tsev thiab kev tswj hwm ib puag ncig (electronics enclosures, office rooj tog, khoom siv)
Cov khoom siv hluav taws xob thiab hluav taws xob qhov chaw tiv thaiv yuav tsum raug txo kom tsawg
Fasteners xav tau kev tswj lub zog meej (automotive sab hauv, precision sib dhos)
Kho kom zoo nkauj daim ntaub ntawv thov kom ci xim hlau zoo li
Kev lag luam raug txwv nruj hexavalent chromium (RoHS-raws li hluav taws xob, khoom siv kho mob)
6. Kev txiav txim siab ib puag ncig thiab kev tswj hwm
表格
| Yam | Xim Zinc | Dawb / Xiav Zinc |
|---|---|---|
| Hexavalent chromium cov ntsiab lus | Keeb kwm siab; niaj hnub trivalent versions muaj tab sis yuav txi ib co kev ua tau zoo | Feem ntau trivalent chromium los yog chromium -dawb |
| RoHS / REACH ua raws | Ib txwm daj chromate feem ntau tsis ua raws li -; trivalent lwm txoj kev ua raws | Feem ntau ua raws li cov lus qhia ib puag ncig |
| Kev kho dej khib nyiab | Heaver chromate load yuav tsum tau kho ntau dua | Tsawg ib puag ncig lub nra |
| Kev nyab xeeb ua haujlwm | Cov ntaub ntawv hexavalent yog carcinogenic; xav tau cov txheej txheem tuav tswj nruj | Trivalent systems muaj kev nyab xeeb dua |
7. Tus nqi thiab txheej txheem kev lag luam
表格
| Qhov xwm txheej | Xim Zinc | Dawb / Xiav Zinc |
|---|---|---|
| Cov nqi tshuaj | Siab dua (ntau dua chav da dej, immersion ntev) | qis |
| Lub sijhawm txheej txheem | Ntev immersion (15-30 vib nas this ib txwm) | Shorter immersion (5-15 vib nas this) |
| da dej tu | Kev soj ntsuam ntau zaus thiab rov ua dua | Yooj yim tswj |
| Tag nrho cov nqi plating | 10-30% siab dua zinc dawb | Baseline siv |
8. Kev txhim kho niaj hnub
Trivalent Chromium Xim PassivationAdvanced trivalent chromium formulations tam sim no tsim daj- cov yeeb yaj kiab iridescent mus txog qhov ua tau zoo hexavalent (72-120 teev NSS dawb xeb), hla qhov sib txawv ntawm kev ua raws li ib puag ncig thiab kev tiv thaiv corrosion.
Dub thiab Olive Drab ChromatesCov kev hloov pauv tshwj xeeb txuas ntxiv cov xim spectrum rau cov tub rog tshwj xeeb lossis cov kev xav zoo nkauj, muab cov kev cuam tshuam nruab nrab ntawm cov xim daj thiab cov yeeb yaj kiab ntshiab.
Chromium-Txoj Kev Xaiv DawbSilicate-raws li, molybdate-raws li, thiab tsis tshua muaj - lub ntiaj teb hloov cov coatings tau tshwm sim rau ob qho tib si xim thiab cov ntawv ntshiab, txawm hais tias feem ntau corrosion kuj tseem nyob hauv qab chromate benchmarks.
Summary Comparison Table
表格
| Feature | Xim Zinc | Dawb / Xiav Zinc |
|---|---|---|
| Qhov txiaj ntsig tseem ceeb | Maximum corrosion kuj | Bright tsos, conductivity, ib puag ncig ua raws |
| Kev tiv thaiv corrosion | Zoo heev | Nruab nrab |
| Qhov tshwm sim | Yellow / zaj sawv iridescent | Silvery-dawb / ci xim hlau |
| Ib puag ncig zoo tshaj plaws | Sab nraum zoov, hnyav, kev pabcuam ntev | Sab hauv, tswj, kho kom zoo nkauj |
| Cov khoom hluav taws xob | Rwb thaiv tsev | Kev coj ua |
| Environmental profile | Ib txwm formulations teeb meem; niaj hnub trivalent txais | Feem ntau pom zoo |
| Nqi | Siab dua | qis |
