Vim li cas thiaj muaj qhov pom tseeb ntawm cov pits ntawm qhov chaw ntawm welded steel kav tom qab over-pickling?

Tom qab pickling, welded steel kav, tshwj xeeb tshaj yog cov welded los ntawm cov roj los yog rauv txoj kev, yog nquag mus tsim corrosion pits raws longitudinal weld seams. Yog vim li cas rau qhov tshwm sim ntawm cov pawg ntawm corrosion pits nyob rau hauv weld seams feem ntau yog vim qhov kub ntawm qhov sib txawv ntawm cov vuam thiab lub hauv paus hlau thaum lub sij hawm vuam txheej txheem, uas ua rau muaj kev ntxhov siab nyob rau hauv. Cov cheeb tsam uas muaj kev ntxhov siab sab hauv muaj qhov cuam tshuam rau qhov sib txawv ntawm kev xeb los ntawm cov tshuaj pickling. Tsis tas li ntawd, oxides thiab lwm yam impurities nias rau hauv cov yaj yaj thaum lub vuam txheej txheem muaj qhov sib txawv corrosion ntawm cov kua dej vim lawv cov hluav taws xob sib txawv, ua rau cov qhov tsis sib xws.