https://pmc.ncbi.nlm.nih.gov/articles/PMC4115763/

Tom qab lubnqus tsev -Kev pab lub mis biopsy koob tau txais kev kho tshuab, nws yuav tsum tau ua ntau yam kev kho mob kom tau raws li kev kho mob - qib yuav tsum tau ua. Peb txheej txheem ntawm passivation, electro- polishing, thiab ultrasonic tu ua ke tsim "daim duab peb sab golden" ntawm qhov zoo. Kab lus no yuav txheeb xyuas cov hauv paus ntsiab lus thiab kev ua haujlwm ntawm txhua tus txheej txheem no ib los ntawm ib qho.

1. Passivation: Txhim kho qhov tsis pom xeb -Cov ntaub ntawv pov thawj

Passivation yog txheej txheem uas siv cov txheej txheem tshuaj los tsim cov oxide zaj duab xis ntom ntom ntawm cov hlau. Rau SS316 stainless hlau, nws yog ib qho tsim nyog rau muab tso rau hauv ib lub citric acid tov (nrog rau qhov concentration ntawm 10-20% thiab kub ntawm 50-60 degree) rau 20-30 feeb. Citric acid chelates dawb hlau ions thiab ib txhij txhawb kev tsim ntawm Cr₂O₃ passivation zaj duab xis. Cov yeeb yaj kiab no tsuas yog 2-5 nm tuab, tab sis nws tuaj yeem tiv thaiv kev nkag mus ntawm cov tshuaj chloride ions thiab ua kom muaj peev xwm corrosion ntawm 200-300 mV. Tom qab passivation, yuav tsum tau kuaj xyuas qhov chaw xiav (siv cov tshuaj potassium ferricyanide txhawm rau txheeb xyuas cov hlau dawb) yuav tsum tau ua. Tus qauv tsim nyog yog tias tsis muaj cov pob xiav tshwm hauv 30 vib nas this. Cov kauj ruam no ua kom muaj kev tiv thaiv corrosion ntawm rab koob lub cev ob sab hauv thiab sab nraud lub cev, kom tsis txhob muaj cov kab mob inflammatory tshwm sim los ntawm kev tso tawm ntawm cov hlau ions.

II. Electro-Polishing: Daim iav-Zoo li luster thiab tsis tshua muaj kev sib txhuam nto

Electro- polishing siv lub hauv paus ntsiab lus ntawm electrochemical anode dissolution. Lub workpiece yog immersed nyob rau hauv ib tug sib tov electrolyte ntawm phosphoric acid thiab sulfuric acid. After connecting a direct current, the areas with higher surface protrusions have a higher current density and a faster dissolution rate, thereby achieving a smooth and shiny surface. Electro- polishing tuaj yeem tshem tawm cov micro- tawg, burrs, thiab cov txheej txheem kev ntxhov siab sab laug los ntawm kev siv tshuab, txo qhov roughness ntawm Ra 0.8 μm rau Ra Tsawg dua lossis sib npaug li 0.2 μm. Rau VABB koob, lub ntsej muag du coj ob qho txiaj ntsig loj: ua ntej, nws txo qis kev ua haujlwm thiab txo cov ntaub so ntswg tearing; thib ob, nws txo cov kab mob adhesion, ua kom yooj yim dua. Tom qab electro{10}} polishing, lub workpiece yuav tsum tau muab yaug nrog dej deionized kom tshem tawm cov khoom seem ntawm electrolyte thiab raug kuaj ntsev ntsev raws li ASTM B912 los xyuas kom meej corrosion kuj.

III. Ultrasonic Tu: Qhov kawg txoj hauv kev kom ua tiav Nanoscale Cleanliness

Txawm tias tom qab electro- polishing, qhov saum npoo ntawm rab koob lub cev tseem tuaj yeem nqus cov roj stains, plua plav, lossis cov khib nyiab hlau. Ultrasonic tu siv 20–40 kHz siab- zaus vibrations los tsim cavitation cuam tshuam nyob rau hauv cov tshuaj ntxuav - npuas tsim nyob rau hauv qhov tsis zoo siab cheeb tsam thiab vau sai heev nyob rau hauv lub zoo siab cheeb tsam, tso lub zos kub thiab siab siab (kwv yees li 5000 K, 1000 remants) thiab quab yuam remants. Cov txheej txheem ntxuav feem ntau suav nrog: alkaline degreasing → deionized dej yaug → cawv dehydration → cua kub ziab. Tom qab ntxuav, qhov concentration ntawm cov khoom hauv cov tshuaj ntxuav (Ntau dua lossis sib npaug ntawm 10 μm cov khoom tsawg dua lossis sib npaug li 100 ib mL) yuav tsum tau kuaj xyuas siv cov khoom txee los xyuas kom ua raws li ISO 14644 cov qauv huv huv. Rau cov cuab yeej zoo li VABB koob uas tuaj rau hauv kev sib cuag ncaj qha nrog cov ntaub so ntswg nyob, kev ntxuav ultrasonic yog ib qho tseem ceeb kawg ntawm kev tiv thaiv kab.

IV. Tus nqi ntawm peb -Kev sib koom ua ke

Passivation, electro- polishing, thiab ultrasonic tu tsis yog kev ua haujlwm ywj pheej tab sis ua kom sib ntxiv. Passivation muab tshuaj tiv thaiv, electro- polishing txhim kho lub cev nto, thiab ultrasonic tu tshem tawm cov seem. Thaum peb qhov no tau ua tiav ua ke, VABB koob ib txhij muaj kev tiv thaiv corrosion siab, tsis muaj kev sib txhuam, thiab ultra- kev huv huv siab, ua tau raws li cov cai nruj ntawm ISO 13485 rau kev kuaj xyuas cov khoom siv kho mob.

Xaus

Kev kho saum npoo yuav zoo li yooj yim, tab sis nws yeej muaj ntau yam kev kawm xws li electrochemistry, fluid mechanics, thiab acoustic chemistry. Nws yog peb qhov "tsis pom" cov txheej txheem uas muab lub tshuab nqus tsev- pab lub mis biopsy koob muaj peev xwm ua haujlwm nyab xeeb thiab ua tau zoo hauv lub cev, dhau los ua tus ncej tseem ceeb ntawm kev ntseeg siab ntawm kev siv tshuab biopsy tsawg tsawg.