Crevice corrosion yog ib qho chaw nres tsheb ntawm ib qho chaw hlau ntawm, los yog tam sim ntawd nyob ib sab, qhov sib txawv los yog crevice ntawm ob qhov chaw sib koom thaum raug rau cov electrolyte stagnant.
Qhov no tuaj yeem tshwm sim ntawm ob lub hlau lossis cov khoom siv hlau thiab cov khoom tsis yog hlau -- txawm tias ob qho khoom siv yuav tiv thaiv corrosion yam tsis muaj qhov sib txawv.
Feem ntau, cov electrolyte yuav tsis teeb meem thaum xub thawj. Txawm li cas los xij, raws li nws tseem nyob hauv qhov crevice, qib oxygen yuav deplete.
Qhov no tom qab ntawd ua rau cov nyiaj seem ntawm cov hlau zoo nyob rau hauv qhov crevice, tig sab hauv ntawm qhov crevice mus rau hauv ib qho anodic node.
Cov kev daws teeb meem nyob ib puag ncig yuav sim ntsuas qhov xwm txheej no los ntawm kev xa cov ions tsis zoo rau hauv qhov crevice (feem ntau nyob rau hauv daim ntawv ntawm chloride ions) ntxiv txhim kho cov kua qaub thiab tawm tsam cov hlau.
Sab laug unchecked, cov txheej txheem tuaj yeem pub nws tus kheej, ua kom nrawm nrawm ntawm tus nqi astounding -- txawm rau alloys xws li stainless hlau nrog ib tug muaj zog passive txheej.
Cov cheeb tsam uas yuav raug crevice corrosion muaj xws li:
Bolted thiab riveted kev sib txuas
Nyob rau hauv lub washers, gaskets, thiab clamps
Hauv qab rwb thaiv tsev
Hauv cov pob qij txha
Nyob rau hauv fasteners threads
Yog tias tag nrho cov suab no nyuaj me ntsis, tsuas yog nco ntsoov tias thaum electrolyte tuaj yeem nyob hauv thaj chaw me me ntawm ib daim hlau thiab lwm qhov chaw (hlau lossis cov hlau tsis yog hlau), qhov kev pheej hmoo ntawm crevice corrosion nce.
Cov lus piav qhia yooj yim no muab rau koj ntau txoj hauv kev los txo qhov kev pheej hmoo ntawm corrosion tshwm sim.