Indlela I-Ion Exchange Enika Amandla Ukuvikelwa Kokugqwala Okusebenzayo: Ukuchaza Umthetho Wokugquma Kwe-Passivation Ye-Silica Anti-Corrosive Pigments

Kwadalwa ngo 09.02

Umsebenzi wemigqomo yokuvikela ukugqwala kudala ungezinye zezihloko ezithakazelisayo kakhulu kusayensi yokupenda. Imigqomo yendabuko yokuvikela ukugqwala incike kakhulu 'ekusebenzeni kwezithiyo' — yakha isivikelo esingokomzimba phezu kwensimbi ukuze ivimbele ukungena kwamanzi, umoya-mpilo, nama-ion abangela ukugqwala. Nokho, le ndlela yokuzivikela iyahluleka ngokushesha uma upende luthola imihuzuko noma izimbobo ezincane, okuvumela ukugqwala ukuba kusakazeke. Imigqomo yokuvikela ukugqwala esekelwe ku-silica ene-calcium ion exchange ithatha indlela ehluke ngokuphelele: ifinyelela ukuvikela ukugqwala okusebenzayo ngokushintshana kwama-ion, iphazamisa uchungechunge lwe-electrochemical corrosion emthonjeni wawo.

Ukuqhathanisa kokwehluleka kokuvikela kwe-barrier engenzi lutho nokuvikelwa kokugqwala okusebenzayo kwe-ion-exchange ngama-pigment e-silica avikela ukugqwala

Ukuqonda Indlela Yokuvimbela Ukushintshana Kwama-Ion

Enkabeni ye-calcium ion-exchanged silica anti-corrosive pigments kukhona i-amorphous silica carrier elungiswe nge-calcium oxide. Ngaphakathi kwesakhiwo sayo esinezimbotshana ezincane, ama-calcium ion (Ca²⁺) alayishwa ngaphambilini ezindaweni ezisebenzayo ebusweni be-silica. Uma upende usufakwe phezu kwensimbi, lezi zinhlayiya zokusebenza zihlakazeka ngokufanayo kuwo wonke umugqa wocwecwe, zihlale zisesimweni 'sokulinda'.

Uguquko olubalulekile lwenzeka lapho izinto ezikhipha ukugqwala ziqala ukungena kusembozo. Njengoba umswakama, ama-ion e-chloride (Cl⁻), ama-ion e-sulfate (SO₄²⁻), nezinye izinhlobo ezikhipha ukugqwala zingena ngemigodi emincane yesembozo zibheke phansi kwensimbi, zihlangana nezinhlayiya zepigimenti. Kulesi sikhathi, ama-ion e-calcium ku-silica carrier ayashintshwa futhi akhishwe ama-ion akhipha ukugqwala angenayo, kuyilapho ama-ion e-silicate (SiO₃²⁻) ngesikhathi esifanayo encibilika ngamanani amancane kusuka ebusweni be-silica. Ama-ion e-calcium ne-silicate akhishiwe, lapho efika ebusweni bensimbi, asabela nama-hydroxyl group enza ifilimu evikelayo eminyene, engenzi lutho ye-calcium silicate. Leli filimu liwungqimba lokuvikela oluhlukanisa ubuso bensimbi ezintweni ezikhipha ukugqwala kuyilapho lucindezela kokubili ukusabela kwe-electrochemical kwe-anodic ne-cathodic — linikeza ukuvikelwa okusebenzayo ekugqwaleni.

Umdwebo we-microscopic wokushintshana kwe-calcium ion ku-pigment ye-silica enezimbotshana yakha ungqimba lokuvikela lwe-calcium silicate ensimbi

Umehluko Oyisisekelo Kunezindlela Zendabuko

Ama-zinc phosphate anti-corrosive pigments avamile ancike kakhulu ekwakheni amafilimu e-iron phosphate noma e-zinc phosphate ekuvikelweni kwensimbi. Kodwa-ke, ukusebenza kwawo kuncike kakhulu ezingeni le-pH, futhi ukusebenza kwawo kuvame ukungabi kahle ezindaweni ezinamafutha noma ezingathathi hlangothi. Ama-chromate pigments anikeza ukuvikelwa okuhle kakhulu ekugqwaleni, kodwa ama-hexavalent chromium ion awo anobuthi obukhulu futhi angabangela umdlavuza, futhi asevinjelwe ezimakethe ezinkulu zomhlaba wonke.

Ngokuphambene, indlela yokushintshana kwama-ion ye-calcium ion-exchanged silica pigments inikeza izinzuzo ezimbalwa ezihlukile. Okokuqala, iyindlela yokuvikela 'ecushiwe' — isebenza kuphela lapho ama-ion agqwalayo engena, igwema ukusetshenziswa ngokweqile ngaphansi kwezimo ezijwayelekile futhi ngaleyo ndlela inikeze ukuvikelwa okuhlala isikhathi eside. Okwesibili, ungqimba lwe-calcium silicate passivation olumphumela luzinzile ngokwamakhemikhali futhi aluncibiliki emanzini, lunamathela ebusweni bensimbi isikhathi eside. Okwesithathu, yonke inqubo ayibandakanyi izinsimbi ezisindayo noma izinto ezinobuthi, ihlangabezana ngokugcwele nezidingo zemvelo.

Ngaphezu kwalokho, lo mklamo olawulwayo wokuncibilika okuncane unikeza inzuzo eyengeziwe: ngenxa yokuthi izinga lokukhishwa kwama-ion e-calcium ne-silicate ligcinwa ngokunembile likuphansi kakhulu, ukuncibilika ngokweqile okungabangela ukuqhuma kwefilimu noma ukwanda kokungena kwamanzi kuyagwenywa. Ukuhlolwa okusebenzayo kukhombisa ukuthi izinhlelo zokumboza ezisebenzisa lezi zinsimbi zinciphisa ngempumelelo ukuqhuma nokungena kwamanzi kuyilapho zithuthukisa ukunamathela phakathi kokumboza nensimbi engaphansi.

Ubukhulu Obuphezulu Bendalo Yobuso Nokuhlangana Okusebenzisanayo

I-calcium ion-exchanged silica anti-corrosive pigments ngokuvamile ziba nendawo ephezulu yobuso obuthile, okusho ukuthi inani elithile le-pigment linikeza izindawo eziningi zokushintshana kwama-ion. Isibonelo, imikhiqizo ye-ZLSIL™ series ilawula usayizi wezinhlayiyana ze-D50 phakathi kuka-3.0 no-4.0 micrometers ngokusabalalisa okuncane, ithola ukuhlanganiswa okuhle kakhulu kuma-coatings. Inhlanganisela yendawo ephezulu yobuso obuthile nosayizi wezinhlayiyana ofanayo iqinisekisa ukuthi ukushintshana kwama-ion kuqhubeka ngokufanayo nangempumelelo kuwo wonke i-coating film.

Ekwakhiweni okusebenzayo, ama-pigment e-silica ashintshwe nge-calcium ion angakhiqiza nemiphumela ehambisanayo yokuvikela ukugqwala uma ehlanganiswa namanye ama-pigment avikela ukugqwala asebenzayo. Isibonelo, uma esetshenziswa kanye nenani elincane le-zinc phosphate noma ama-pigment e-molybdate, izindlela ezahlukene zokuvimbela ziyahlangana, zinikeze ukuvikelwa ebangeni elibanzi le-pH nangaphansi kwezimo ezahlukene zokugqwala. Lokhu kuhambisana kuvumela abakhi be-coatings ukuthi banciphise ukusetshenziswa kwama-pigment anobuthi — noma ngisho ukufeza ukwakhiwa okungenazo ngokuphelele izinsimbi ezisindayo — kuyilapho kugcinwa ukusebenza kokuvikela ukugqwala.

Ngokombono wokuthuthukiswa kobuchwepheshe, imibala elwa nokugqwala eyenziwe ngokushintshana kwama-ion imele ukuguquka okubalulekile emibaleni elwa nokugqwala — kusukela 'ekuvikeleni okungenzi lutho' kuya 'ekuvikeleni okusebenzayo nokuhlakaniphile.' Njengoba ubuchwepheshe be-nanotechnology kanye nokuthuthukiswa kobuso bezinto kuqhubeka, imibala ye-silica elwa nokugqwala yesikhathi esizayo kulindeleka ukuthi ilethe ukulawula okunembe kakhudlwana kokushintshana kwama-ion, ukusebenza okuphezulu kokuvimbela, kanye nokuhambisana okubanzi nezinhlelo, okunikeza ukwesekwa kobuchwepheshe okuqinile embonini yemibala yomhlaba wonke ekushintsheni okuluhlaza.