Cov lus piav qhia: Cov kab lus no yog lub hom phiaj los piav qhia txog plaub txoj hauv kev uas feem ntau siv los kuaj xyuas cov khoom ntawm stainless hlau lub luj tshib kom ua tiav lub hom phiaj ntawm kev txheeb xyuas cov khoom ntawm stainless hlau luj tshib.
1. Nitric acid point test
Cov yam ntxwv tseem ceeb ntawm stainless hlau luj tshib: lawv muaj qhov muaj zog tiv thaiv corrosion rau concentrated nitric acid thiab dilute nitric acid. Cov cuab yeej no tuaj yeem siv tau kom paub qhov txawv ntawm lub luj tshib stainless hlau los ntawm feem ntau lwm cov luj tshib hlau lossis alloy luj tshib. Lub luj tshib hlau uas tsis yog-ferrous yuav corroded tam sim ntawd thaum lawv ntsib concentrated nitric acid. Dilute nitric acid yog corrosive heev rau carbon steel luj tshib, tab sis high-carbon 420 thiab 440 steel luj tshib yog me ntsis corroded thaum lub sij hawm ntsuam xyuas nitric acid point, uas yuav tsum tau dialectical kev pom zoo.
2. Sulfuric acid xeem
Qhov ntsuas sulfuric acid immersion stainless hlau luj tshib tuaj yeem paub qhov txawv ntawm ntau hom stainless hlau luj tshib. Piv txwv li, cov qauv ntawm 302 thiab 304 stainless hlau luj tshib yog finely av tom qab trimming, thiab ces muab tso rau hauv nitric acid (tshwj xeeb lub ntiajteb txawj nqus 1.42) nrog ib tug ntim concentration ntawm 20 ~ 30% thiab ib tug kub ntawm 60 ~ 66 degree rau tu thiab passivation. rau ib nrab teev. Thaum kawg, nws tau muab tso rau hauv cov tshuaj sulfuric acid nrog qhov ntim ntawm 10% thiab rhuab mus rau 71 degree. Thaum 302 thiab 304 stainless hlau lub luj tshib kuaj tau muab tso rau hauv cov tshuaj kub no, lawv tau corroded thiab ua npuas ntau, tig dub hauv ob peb feeb; thaum 316 thiab 317 stainless hlau lub luj tshib kuaj tsis corroded los yog hnov mob qeeb heev (tsis muaj npuas tsim), thiab cov qauv tsis hloov xim tsis pub dhau 10-15 feeb.
3. Copper sulfate qhov chaw kuaj
Qhov kev kuaj tooj liab sulfate yog ib txoj hauv kev yooj yim kom paub qhov txawv ntawm cov pa roj carbon zoo tib yam lub luj tshib thiab txhua hom stainless hlau luj tshib. Qhov chaw kuaj yuav tsum tsis muaj roj los yog ntau yam impurities thiab polished nrog ib daim ntaub mos mos, thiab tom qab ntawd ib tug 5-10% tooj liab sulfate tov yog dripped rau hauv qhov chaw ntxuav nrog ib tug dropper. Ordinary carbon steel los yog hlau luj tshib yuav tsim ib txheej ntawm nto metallic tooj liab nyob rau hauv ob peb vib nas this, thaum lub nto ntawm stainless hlau yuav tsis ua tooj liab nag lossis daus xim tooj liab.
4. Magnetic test
Kev ntsuam xyuas sib nqus yog ib txoj hauv kev yooj yim kom paub qhov txawv ntawm qhov annealed austenitic stainless hlau luj tshib los ntawm ferritic stainless hlau luj tshib. Austenitic stainless hlau yog cov hlau tsis muaj hlau nplaum (thaum ntsib austenitic stainless hlau lub luj tshib nrog cov hlau nplaum tsis muaj zog, nws yuav tsum xav txog tias lawv yuav muaj cov hlau nplaum me ntsis tom qab txias ua haujlwm nyob rau hauv siab, thiab feem ntau cov hlau nplaum yuav raug tshem tawm tom qab annealing thiab kev kho mob) ; thaum ntshiab chromium steel thiab qis alloy steel luj tshib yog ob qho tib si sib nqus hlau.
