Rau Pigment Production (TiO₂ ntawm Cov Txheej Txheem Chloride) Kub Ferric Chloride Solution (25%) ntawm 70 degree, Titanium Alloy Resistant Abrasion{2}}Corrosion los ntawm Khoom TiO₂ Particles?

Cov txheej txheem chloride rau kev sib txuas ntawm titanium dioxide (TiO 2) cov xim siv 25% ferric chloride (FeCl 3) tov ntawm 70℃raws li chlorinating tus neeg sawv cev. Cov tshuaj muaj cov tshuaj TiO2 tshem tawm (1-10 ​​µm txoj kab uas hla) uas yog abrasive heev. Cov raj cua sov rau hauv cov slurry no yog ib txhij raug rau kev puas tsuaj (tshem tawm cov khoom los ntawm cov khoom siv) thiab corrosion (electrochemical dissolving ntawm raug hlau). Qhov kev sib koom ua ke no - abrasion - corrosion ua rau cov khoom poob nqi ntau dua li ob qho tib si. Txoj kev tshawb no ntsuas qhov puas-corrosion tsis kam ntawm titanium qib (2, 7, 12 thiab 24) hauv TiO 2-laden ferric chloride thiab txhais cov alloy zoo tshaj plaws rau cov kev pabcuam no.

Abrasion Corrosion Mechanism
Ntawm titanium, cov txheej tiv thaiv kev tiv thaiv tsis tu ncua los ntawm kev cuam tshuam rau hauv cov corrosive slurry nrog cov khoom. Cov tshuaj FeCl3 aggressive exposes tshiab liab qab titanium uas corroded sai sai thiab repassivated, tsuas yog kom muaj cov tshiab zaj duab xis tshem tawm los ntawm cov particle tom ntej. Lub synergy yam (tag nrho cov hnav / tag nrho ntawm cov ntshiab abrasion thiab ntshiab corrosion) yog nruab nrab ntawm 2 thiab 10 rau titanium alloys.

Cov yam ntxwv tseem ceeb: Particle hardness (TiO2 yog ib qho nyuaj, Mohs 6-7) Particle shape (Angular particles are more abrasive) Velocity (Higher velocity tsub kom muaj zog cuam tshuam) Lub kaum sab xis ntawm qhov cuam tshuam (ib txwm cuam tshuam ua rau muaj kev puas tsuaj ntau dua li glancing)

Cov Kev Ntsuas Sib Piv
Slurry erosion- kev ntsuam xyuas kev tiv thaiv corrosion nrog lub tshuab spinning (linear tshaj tawm 2 m / s, TiO2 hais 10 wt%, FeCl3 25%, 70℃, 100 h):

Qib 2 (kev lag luam ntshiab): Passive film tshem tawm sai. Corrosion tus nqi ntawm abrasion 0.8-1.2 hli / xyoo. Deep gouges thiab pits ntawm qhov chaw. Tom qab 100 teev, qhov hnyav poob sib npaug rau qhov nkag ntawm 0.1 hli. Qib 2 tsis ua haujlwm.

Qib 7 (Ti-0.15Pd): Palladium tsim cathodic hloov kho marginally txhim kho corrosion tab sis tsis nce hardness. Tus nqi ntawm abrasion-corrosion yog 0.5-0.9 hli / xyoo. Nws yog tshaj 2nd chav kawm, tab sis tseem siab. Mos matrix (~ 180 HV hardness) yog yooj yim hnav.

Qib 12 (Ti-0.3Mo-0.8Ni) Hardness yog nce mus txog 200-220 HV los ntawm molybdenum thiab nickel. Tus nqi ntawm abrasion-corrosion yog 0.3-0.6 hli hauv ib xyoos. Zoo rau kev pabcuam nruab nrab tab sis tsis yog qhov zoo tshaj plaws. Qhov kev ua tau zoo dua yog vim qhov tawv tawv tsis muaj zog tiv thaiv corrosion.

Qib 24 (Ti-6Al-4V-0.1Ru): alpha-beta alloy nrog hardness ntawm 320-360 HV (annealed), tshav kub-kho rau 380-400 HV. Ruthenium (0.1%) muab corrosion kuj zoo ib yam li Qib 7. Tus nqi ntawm abrasion-corrosion: 0.08-0.15 mm / xyoo, 5-10 npaug zoo dua Qib 2. Cov tawv tawv resists particle cuam tshuam thiab yog li tuav cov zaj duab xis passive ntev dua. Tom qab 100 h tsuas yog khawb qhov muag pom, tsis muaj khawb.

Hardness raws li qhov tseem ceeb Parameter
Titanium Qib Hardness (HV, annealed) Abrasion -Tus nqi Corrosion (mm/xyoo) Tus txheeb ze tus nqi kwv yees
Qib 2 150-180 0.8-1.2 1x 1.0x
Qib 7 150-180 0.5-0.9 1.3-1.6x 1.4x Qib 12 200-220 0.3-0.6 2-3x 1.3x
Qib 24 (annealed) 320-360 0.08-0.15 6-12x 2.0-2.5x
Qib 24 (hnub nyoog) 380-400 0.05-0.10 10-15 zaug 2.2-2.8 npaug
Hastelloy C-276 (rau kev siv) 250-300 0.08-0.12 Zoo ib yam li Qib 24 3.5-4.0x
Daim ntawv thov Matrix rau TiO2 Slurry rhaub
Service Condition Particles/cm3Particle Size Flow Velocity Recommended Titanium Alloy Expected Life (1.65 mm phab ntsa)
Cov khoom qis qis, qis tshaj tawm<5 wt% <5 µm <1 m/sec Grade 12 3-5 years
Cov khoom nruab nrab 5-15 wt % 5-15 µm 1-2 m/s Qib 24 (annealed) 5-8 xyoo
High Solids 15-25 wt% 10-50 µm 2-3 m/sec Qib 24 (hnub nyoog) 4-6 xyoo
Any service with big angular particles >50 µm 3 m / s Qib 24 nrog phab ntsa tuab (2.5 hli) 5-7 xyoo
Severe service (reboiler, high turbidity)Any Any >3 m/s Qib 24 lossis Hastelloy C-276 Tsim tau teev tseg

Qib 24 titanium (Ti-6Al-4V-0.1Ru) muaj qhov zoo tshaj plaws tiv thaiv rau ob qho tib si puas thiab corrosion nyob rau hauv zus tau tej cov pigments los ntawm cua sov ferric chloride (25%) nrog tshem tawm TiO₂ hais ntawm 70 degree. Nws lub siab hardness (320-400 HV) tiv thaiv particle cuam tshuam, thaum lub ruthenium muab nws corrosion kuj piv rau Qib 7. Kev cia siab lub neej nrog 1.65 hli phab ntsa yog 5-8 xyoo-6-12 lub sij hawm ntev dua Qib 2. Qib 12 yog tsim nyog rau qis tshaj tawm los yog cov khib nyiab tsis tshua muaj kev pab cuam tab sis yuav tsis ua hauj lwm ua ntej. Tsis muaj kev pab cuam particle raug pom zoo nyob rau hauv ib puag ncig no qib 2 thiab qib 7. Rau Qib 24, txiav txim annealed lossis laus raws li qhov yuav tsum tau ua los ntawm hardness specifications. Rau kev txhim kho tshiab, xav txog Qib 24 cov hlab nrog 2.0 hli phab ntsa kom muaj kev nyab xeeb ntxiv . - Tsim kom muaj kev saib xyuas txhua xyoo ultrasonic thickness ntawm qhov khoov thiab qhov chaw nkag qhov chaw uas muaj qhov cuam tshuam loj tshaj plaws. Yog tias koj muaj Qib 2 lossis Qib 12 lub rhaub uas ua tsis tau thaum ntxov, xav txog kev hloov kho rau Qib 24 thaum lub sijhawm hloov tom ntej. Tus nqi nce qib ntawm qib 24 (2-2.5 npaug ntau dua qib 2) yog them los ntawm kev pab cuam lub neej ntau dua thiab tsawg dua lub sijhawm hloov cov cua sov.