1. Cov pa phem thaum yaug
Tom qab cov fasteners yog quenched, lawv raug ntxuav nrog ib tug silicate ntxuav thiab rinsed. XX cov teeb meem tshwm sim ntawm qhov chaw. Cov tshuaj tau soj ntsuam los ntawm infrared spectrometer thiab paub tseeb tias yog inorganic silicate thiab hlau oxide. Qhov no yog vim tsis tiav yaug ntawm lub fastener nto thiab residual silicate.
2. Tsis tsim nyog stacking ntawm fasteners
Fasteners qhia cov cim ntawm discoloration tom qab tempering. Soak lawv hauv ether. Tom qab evaporation ntawm ether, ib qho oily residue tau pom. Cov tshuaj no muaj ntau hauv lipids. Qhia tau hais tias cov fasteners tau kis los ntawm cov tshuaj ntxuav thiab quenching roj thaum lub sij hawm yaug, thiab melted nyob rau hauv lub tshav kub kev kho mob kub, tawm hauv chemical burns caws pliav. Cov tshuaj no ua pov thawj tias qhov chaw ntawm lub fastener tsis huv. Kev tshuaj xyuas los ntawm infrared spectrometer, nws yog ib qho sib xyaw ntawm cov roj hauv paus thiab ether hauv cov roj quenching. Ether tuaj yeem yog los ntawm kev ntxiv cov roj quench. Cov txiaj ntsig kev soj ntsuam ntawm cov roj quenching ntawm lub tshuab hluav taws xob mesh tau lees paub tias cov fasteners tau me ntsis oxidized nyob rau hauv cov roj quenching vim tsis tsim nyog stacking thaum lub sij hawm cua sov, tab sis nws yuav luag negligible. Qhov tshwm sim no muaj feem xyuam rau cov txheej txheem ntxuav, tsis yog cov roj quenching. lus nug.
3. Deg residue
Muaj ib qho dawb residue ntawm lub siab-lub zog ntsia hlau, uas tau lees paub tias yog phosphide los ntawm infrared spectrometer tsom xam. Nws tsis tau ntxuav nrog acidic detergent, thiab lub tank yaug tau kuaj xyuas kom pom tias cov kua tank muaj cov pa roj carbon ntau solubility. Lub tank yuav tsum tau nchuav tawm tsis tu ncua, thiab qib concentration ntawm cov lye hauv lub tank yaug yuav tsum tau kuaj xyuas ntau zaus.
4. Alkali hlawv
Cov ntsia hlau muaj zog muaj zog yog quenched thiab blackened, thiab sab nrauv yog sib xws thiab du, oily dub. Txawm li cas los xij, muaj thaj tsam XX txiv kab ntxwv pom ntawm qhov muag liab qab ntawm lub nplhaib sab nraud. Tsis tas li ntawd, muaj cov cheeb tsam uas me ntsis bluish los yog reddish. Tus thawj bar thiab hlau yog coated nrog phosphating zaj duab xis, uas yog yooj yim rau txias taub hau thiab tapping. Kev kho cua sov ncaj qha yam tsis muaj rinsing, txias hauv quenching roj, ntxuav nrog alkaline detergent, ziab (tsis rinsing), tempering ntawm 550 degree, tom qab tshem tawm cov roj los tiv thaiv xeb nyob rau hauv lub thermal tempering rauv, liab dot threads tau pom nyob rau saum npoo.
Tom qab kev sim, thaj chaw liab ntawm cov ntsia hlau yog tshwm sim los ntawm alkali hlawv. Cov tshuaj chloride- thiab calcium uas muaj cov khoom sib txuas ntawm cov tshuaj ntxuav alkaline tuaj yeem hlawv steel fasteners thaum kho cua sov, tawm hauv qhov chaw ntawm lub fasteners.
Hlau fasteners tsis tuaj yeem tshem tawm cov alkali saum npoo hauv cov roj quenching, yog li cov nplaim yuav raug hlawv nyob rau hauv qhov kub-kub austenite lub xeev, thiab kev puas tsuaj yuav aggravated nyob rau hauv cov kauj ruam tom ntej ntawm tempering. Nws raug pom zoo tias cov fasteners yuav tsum tau ntxuav kom huv si thiab yaug ua ntej kev kho cua sov kom tshem tawm cov alkaline residues uas ua rau cov fasteners hlawv.
5. Kev ywg dej tsis raug
Rau qhov loj-loj fasteners, polymer aqueous tov quenching feem ntau yog siv. Ua ntej quenching, ntxuav thiab yaug nrog alkaline ntxuav tus neeg sawv cev. Tom qab quenching, sab hauv ntawm lub fastener tau xeb. Infrared spectrometer tsom xam tau lees paub tias ntxiv rau cov hlau oxide, muaj sodium, potassium thiab sulfur, qhia tias muaj alkaline tu tus neeg sawv cev hauv lub fastener, uas yuav muaj cov poov tshuaj hydroxide, sodium carbonate lossis cov khoom zoo sib xws, uas txhawb nqa nws cov xeb. Cov fasteners yog yaug los xyuas kom muaj kev sib kis ntau dhau, thiab kev hloov pauv dej nquag raug pom zoo. Tsis tas li ntawd, ntxiv cov tshuaj tiv thaiv xeb rau cov dej kuj yog ib txoj hauv kev zoo.
6. Ntau dhau corrosion
High-strength fasteners feem ntau pom ib co dub streaks, uas peb kuj pom nyob rau hauv peb thwmsim, qhov uas peb rinsed lub fasteners nrog inorganic thiab organic tu cov neeg ua ntej kev kho cua sov. Tseem muaj cov streaks dub tom qab quenching, txawm tias tom qab ua tib zoo ntxuav ua ntej kev kho cua sov. , streaks kuj tseem tshuav tom qab kev kho cua sov. Kev soj ntsuam ntawm cov pa phem nyob rau ntawm qhov chaw los ntawm infrared spectrometer qhia tau hais tias muaj ntau ntawm sulfur thiab calcium. Siv ib qho me me ntawm acetic acid thiab isopropanol, quab yuam quav ib daim ntawv lim me me hla qhov chaw dub, tawm hauv qhov chaw dub ntawm daim ntawv lim. Cov ntawv lim tau txheeb xyuas los ntawm ib qho infrared spectrometer, thiab nws tau lees paub tias cov ntsiab lus tseem ceeb yog calcium, sulfur, hlau, manganese thiab chromium.
