Dahaarka budada epoxy anti-corrosion waxay ciyaaraan shaqo ilaalin ah

Codsiga wadajirka ah ee ilaalinta cathodic iyo lakabka ilaalinta daxalka, waxay u ogolaataa qaab dhismeedka birta ee dhulka hoostiisa ama biyaha hoostooda si loo helo ilaalinta ugu dhaqaale iyo waxtarka leh. Caadi ahaan waxaa lagu dahaadhay dahaarka ilaalinta ka hor inta aan la isticmaalin, birta iyo deegaanka dielectric go'doominta korantada, daahan wanaagsan ayaa ka ilaalin kara in ka badan 99% dhismayaasha dusha sare ee daxalka. daahan The tuubada ee wax soo saarka, gaadiidka iyo dhismaha, ma damaanad qaadi karo gabi ahaanba ka dhan ah dhaawac kasta si (buuxi daahan afka, cufnaanta daahan, pinhole daahan, iwm), ma suurtowdo in tuubooyinka deegaanka daxalka waa gebi ahaanba go'doon. Laakiin sidoo kale lakabka dahaadhka ka-hortagga daxalka ee walxo kala duwan, heerar kala duwan, nuugista iyo neefsashada, oo si tartiib tartiib ah u aasi doona nuugista. Si loo ilaaliyo daxalka waxtarka leh, waxaa lagama maarmaan ah in la qaato ilaalinta cathodic taas oo ah ilaalinta wadajirka ah. Dahaarka qaro weyn ( dhumucdiisuna> 1mm), ilaalinta wadajirka dhuumaha waa in la doortaa awoodda ilaalinta ee -1.10 ilaa-1.15V (CSE), daahan khafiif ah ( dhumucdiisuna ≤ 1mm) qaado awoodda ilaalinta ee -1.05 to-1.10V (CSE), Iyadoo la tixgelinayo halabuurka ciidda, qoyaanka, heerkulka, noocyada daahan, tayada daahan, iyo sidoo kale microorganisms, hagaajinta habboon ee suurtogalka ilaalinta, labadaba si loo ilaaliyo dhuumaha iyada oo aan la baabi'in daahan anti-daxalka. Daxalka deegaanka qiimaynta ee hadda jira ayaa aad waxtar u leh. "Ilaalinta" waa fikrad muhiim ah halkan, kaas oo ka hortagga daxalka epoxy dusha budada meesha, "ilaalinta"?

Dahaarka cathode-ka daboolan ee dahaarka, saamaynta burburka, dhuumaha birta ee dhabta ah ee la aasay si ay u socodsiiso ilaalinta ugu wanaagsan ee suurtogalka ah ee la xushay daahan ilaalinta cathodic (daahan 3PE, isku-dhafka hoose ee budada epoxy) ayaa ka baxsan sababaha mudan in la baadho. Ku saabsan awoodda ilaalinta ugu fiican. Qalooca hadda jira ee aqoonyahannada ajnabiga ah waxay daraaseeyaan daxalka iyo xaaladaha ilaalinta cathodic, falcelinta dareerinta hydrogen-ka ee xooggan ee-1.15V. Marka loo eego baadhista Malaysia, Diiwaanka Lloyd, Shell waxa ay bixisaa ilaalinta ugu badan ee -1.1V xadka qaadashada-1.15V; Heerka Jarmalka DIN30676-19853.1 wuxuu u akhriyaa sida soo socota: daboolka dhuuban (<1mm) qaro weyn ayaa loo isticmaalay ilaalinta daxalka kiiska, sababtoo ah polarization waxay yeelan doontaa saameyn lid ku ah sida finan yaryar oo la sameeyay, si loo yareeyo saameynta, waa in la xaddidaa baaxadda awoodda ilaalinta sida shaqada daahan, sida awoodda ilaalinta ugu badan ee -1.00 ~~-1.20V (qaraabo CSE) . Dibadda, ayaa si gaar ah u xusay sababta ka iman karta fashilka ee daahan by tiro ka mid ah arrimo, oo ay ku jiraan Halabuurka ciidda, qoyaanka, heerkulka, noocyada daahan, tayada daahan iyo microbial, hiddaha warshadaha.ralWaxaa loo tixgaliyay in laga fogaado in koronto la'aan suurtagal ah lunto -1.05 ~ - 1.10V (CSE) Dahaarka sunta rasaasta ee Cathodic (daahan 3PE xagga hoose ka baxsan habka fusion bonded epoxy budada daahan).

Nooca dahaarka, qoyaanka, heerkulka ayaa go'aamiya dahaarka nuugista biyaha, iska caabinta awoodda dhexgalka shaqada ee dhumucda dahaarka iyo dahaarka xaaladaha isku mid ah. Cilmi-baadhistu waxay muujisay in xabagta epoxy-ku-xiran ee isku-tallaabta ah ay samayn doonto qaddar go'an oo dalool ah iyo kanaal dalool ah oo loogu talagalay molecules-ka biyaha galay resin-ka epoxy-ga. Xalku gaadho daahan / interface biraha, ka tunnel galay film daxalka curiyay at interface la falgalka biraha, lakabka this of film alaabta daxalka si looga hortago falcelinta biraha iyo xalka, iska caabin daahan si tartiib tartiib ah hoos u. Iyada oo aad iyo aad u badan oo daxalka gaadho interface ah, lakabka this of film alaabta daxalka waa la burburiyaa si tartiib tartiib ah, daxalka xoojisay, iyo ugu dambeyntii natiijada in daahan epoxy laga siibo durbaanka. Fusion bonded epoxy budada daahan la daaweeyay ayaa weli qani ku ah ether iyo kooxaha hydroxyl, kooxahan firfircoon iyo dusha tuubada si adag isugu xidhan yihiin curaarta kiimikada si ay u sameeyaan daahan ka hortagga daxalka. Buuxi afka dahaarka, cufan, sababaha pinhole, daahan waa heerar kala duwan ee nuugista biyaha iyo permeability, haddii ilaalinta cathodic waa xad-dhaaf ah, taasoo keentay in horumarinta hydrogen cathodic, oo leh atamka hydrogen firfircoon ee ururay, ilaa xad gaar ah. , hydrogen waxay ether iyo falcelinta hydroxyl, taas oo wiiqaysa xoogga curaarta ee daahan iyo tuubada birta, taasoo keentay in la waayo xoogga dammaanadda. Natiijadu waxay tahay in dahaarka laga saaro tuubada birta.