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Hebei Zhaofeng Environmental Protection Technology Co., Ltd.

Iimpawu ze-chloride ion corrosion zilandelayo

1. Isiphumo sokubola kwesinyithi sibonakaliswe kwimiba emibini: enye kukunciphisa ukubakho kokwenza ifilimu yokuhamba phezu kwento leyo okanye ukukhawulezisa ukutshatyalaliswa kwefilimu yokuhamba, ngaloo ndlela kukhuthazwa umhlwa wendawo; Kwelinye icala, kunciphisa ukunyibilika kwe-CO2 kwisisombululo esinamandla. , Ukunciphisa ukubola kwezinto.

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I-Cl- ineempawu zeradiyo encinci ye-ion, amandla anamandla okungena, kunye ne-adsorption eyomeleleyo yentsimbi. Ukunyuka kokuxinana kweCl-, kokukhona isisombululo se-aqueous sisomelele kwaye isisombululo esisezantsi sokuchasana ne-electrolyte. Kulula ngakumbi kwiCl- ukufikelela kumphezulu wesinyithi kunye nokukhawulezisa inkqubo yokubola kwendawo; ubukho beCl- kwindawo ene-asidi iya kwenza ii-chloride kumphezulu wentsimbi, uze ubeke endaweni ye-FeCO3 ifilimu ngeepropathi ezikhuselayo, okukhokelela kumgangatho wokubola omkhulu. Ngexesha lenkqubo yokubola, iClˉ ayiqokeleli nje kuphela kwimingxuma yokufaka imigodi, kodwa ikwaqokelela kwiindawo apho kungenziwa khona imingxunya yokungena. Le isenokuba yinkqubo yokuqala yokwenziwa kwemingxuma eyakhiwe. Kubonisa ukuba ulwakhiwo lombane oluphindwe kabini kumbonakalo phakathi kwentsimbi ye-matrix kunye nefilimu yemveliso ye-corrosion kulula ukuyikhetha i-Clˉ, eyenza uxinzelelo lweClˉ kujongano lonyuke. Kweminye imimandla, iClˉ iya kuqokelela kwaye yenze i-nuclei, ekhokelela ekukhawuleziseni ukunyibilika kwe-anodic kule ndawo. Ngale ndlela, i-matrix yesinyithi iya kudleka ngokumba nzulu, isenze imingxunya yokujula. Ukunyibilikiswa kwesinyithi se-anode kuya kukhawulezisa ukusasazeka kweClˉ ngokusebenzisa umboniso wemveliso ye-corrosion kwimingxuma yokujula, kwaye yonyuse ukonyuka kweClˉ kwimingxuma yokuhaya. Le nkqubo yekaClˉ Inkqubo ye-catalytic kukuba xa uxinzelelo lweClˉ lugqithise ixabiso elithile elibalulekileyo, isinyithi se-anode siyakuhlala sikwimeko esebenzayo kwaye ayisayi kudlula. Ke ngoko, phantsi kwe-catalysis ye-Clˉ, imingxunya yokuhamba iya kuqhubeka ikhula kwaye inzulu. Nangona umxholo we-Na kwisisombululo uphezulu kakhulu, uhlalutyo lwamandla e-corrosion product alufumananga ubukho be-Na element, ebonisa ukuba ifilimu yemveliso yokulahla inendima ethile ekusasazeni ii-cations kwicala lesinyithi; ngelixa i-anion ilula ukungena. Ifilimu yemveliso engaphezulu komhlwa ifikelela kujongano phakathi kwe-substrate kunye nefilimu. Oku kubonisa ukuba umboniso wemveliso ye-corrosion une-ion ekhethiweyo, ekhokelela kukonyuka koxinzelelo lwe-anion kwi-interface.

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2. Ukubola komhlwa ngentsimbi ye-austenitic nge-ion ye-chloride kubangela ukubola.
Indlela: Iikloridi ion zibekwa lula kwifilimu yokuhamba, zityibilikise iiathom zeoksijini, emva koko zidibane nezitayile kwifilimu yokuhamba ukuze yenze ii-chloride ezinyibilikayo. Ngenxa yoko, umngxunya omncinci utyhidiwe kwisinyithi somzimba esivelileyo. Lemingxunya mincinci ibizwa ngokuba yi-pitting nuclei. Ezi kloride zenziwa lula ngamanzi, ukuze ixabiso le-pH lesisombululo emngxunyeni omncinci lihle, kwaye isisombululo siya kuba neasidi, kunyibilike inxenye yefilimu ye-oxide, kukhokelele kwi-ion zesinyithi ezingaphezulu. Ukuze konakalise ukungathathi cala kombane emngxunyeni, amaQela angaphandle aqhubeka ukuya emoyeni. Ukufuduka kwangaphakathi, isinyithi kwinto engenanto iphinda ihanjiswe ngamanzi. Kulo mjikelo, i-austenitic insimbi engenasici iyaqhubeka ukonakalisa ngokukhawuleza nangokukhawuleza, kwaye ikhula iye kubunzulu bomngxuma de kube kugqityiwe.

3. I-Cl- inefuthe lokuthamba kumqolomba. Xa umhlwa uqala, isinyithi siphulukana nee-elektroni kwi-anode. Ngenkqubela phambili eqhubekayo yokuphendula, isinyithi ngokuqhubekayo siphulukana nee-elektroni, isixa esikhulu se-Fe2 siqokelela kwisithuba, kwaye ioksijini engaphandle kwesithuba akukho lula ukuyifaka. I-Cl ehamba kakhulu ingena kwisithuba kwaye yenze uxinzelelo oluphezulu, i-FeCl2 ehamba kakhulu ne-Fe2, kunye ne-FeCl2 i-hydrolyzed Isizukulwana se-H senza ukuba ixabiso le-pH kwi-crevice lihle liye ku-3 ukuya ku-4, ngaloo ndlela liqinisa ukubola.


Ixesha lokuposa: Aug-12-2021