ʻO ka uhi ʻana i ka pauka epoxy anti-corrosion e pāʻani i kahi hana pale

ʻO ka noi hui ʻana o ka pale cathodic a me ka corrosion protection layer, e ʻae i ka hoʻolālā metala ma lalo o lalo o ka wai e loaʻa ai ka palekana ʻoi aku ka maikaʻi a me ka maikaʻi. Hoʻopili pinepine ʻia me kahi pale pale ma mua o ka hoʻohana ʻana, i ka metala a me ka dielectric kaiapuni ka hoʻokaʻawale ʻana i ka uila, hiki i ka uhi maikaʻi ke pale aku ma mua o 99% o nā hale o ka ʻili o waho mai ka corrosion. ʻAʻole hiki ke hōʻoiaʻiʻo ʻia ka uhi ʻana o ka paipu i ka hana ʻana, ka lawe ʻana a me ke kūkulu ʻana i ka pōʻino (e hoʻopiha i ka uhi waha, ka nui o ka uhi ʻana, ka pinhole coating, a me nā mea ʻē aʻe), ʻaʻole hiki ke hoʻokaʻawale ʻia ke kaiapuni corrosion pipeline. Akā, no ka anti-corrosion insulation papa o nā mea like ʻole, ma nā ʻano like ʻole, absorbent a breathable, a e kanu mālie ʻia ka absorbent. No ka mālama ʻana i kahi anti-corrosion maikaʻi, pono ia e lawe i ka pale cathodic ʻo ia hoʻi, pale hui. ʻO nā uhi mānoanoa (mānoanoa> 1mm), pono e koho ʻia ka pale ʻana o ka pipeline i ka pale ʻana o -1.10 a i ka-1.15V (CSE), ʻo ka uhi lahilahi (ka mānoanoa ≤ 1mm) e lawe i ka hiki ke pale o -1.05 a i-1.10V (CSE), Me ka noʻonoʻo ʻana i ka haku ʻana o ka lepo, ka haʻahaʻa, ka mahana, nā ʻano uhi, ka maikaʻi o ka uhi ʻana, a me nā microorganisms, nā hoʻoponopono kūpono i ka hiki ke pale, ʻelua e pale i ka pipeline me ka luku ʻole i ka uhi anti-corrosion. ʻOi aku ka maikaʻi o ka corrosion o ka polarization i kēia manawa loiloi. ʻO ka "pale" kahi manaʻo koʻikoʻi ma aneʻi, kahi epoxy anti-corrosion ka uhi lepo ma kahi, "pale"?

ʻO ka wehe ʻana o ka cathode i ka uhi ʻana, nā hopena luku, ka paipu kila i kanu ʻia e holo i ka pale maikaʻi loa i koho ʻia ka uhi pale cathodic (3PE coating, ka pauka epoxy i hoʻopaʻa ʻia i lalo) mai nā kumu kūpono e ʻimi. E pili ana i ka pono palekana maikaʻi loa. Ke aʻo ʻia nei ka pōʻaiapuni o nā haole i ka corrosion a me nā kūlana pale cathodic, ikaika ka hydrogen desorption reaction potential of-1.15V. Wahi a ka hoʻokolokolo ʻana ʻo Malaysia, Lloyd's Register, Shell e hāʻawi i ka hiki ke pale ʻoi loa o-1.1V palena lawe-1.15V; German maʻamau DIN30676-19853.1 heluhelu penei: i loko o ka lahilahi uhi (<1mm) mānoanoa i hoʻohana 'ia no ka corrosion pale i ka hihia, ma muli o ka polarization e loaʻa i ka 'ē aʻe hopena e like me blisters i hanaia, i mea e emi i ka hopena, pono e kaupalena i ka. ka laulā o ka hiki ke pale ma ke ʻano he hana o ka uhi ʻana, e like me ka hiki ke pale ʻoi loa o -1.00 ~~-1.20V (relative CSE) . Ma nā ʻāina ʻē, ʻōlelo kikoʻī i ke kumu o ka hiki ʻole o ka uhi ʻana e nā kumu he nui, me ka hoʻohui ʻana i ka lepo, ka haʻahaʻa, ka mahana, nā ʻano uhi, ka maikaʻi o ka uhi a me ka microbial, ka gene ʻoihana.ralManaʻo ʻia e pale aku i ka pau ʻana o ka mana hiki ke nalowale -1.05 ~ - 1.10V (CSE) (E hoʻomanaʻo: ka hoʻohana nui ʻana o ka fusion bonded epoxy powder coating). ʻO ka uhi alakaʻi pale Cathodic (3PE ka uhi ʻana i ka lalo o ka mīkini o fusion hoʻopaʻa ʻia i ka pauka epoxy).

ʻO ke ʻano o ka uhi ʻana, ka haʻahaʻa, ka mahana e hoʻoholo ai i ka uhi ʻana o ka wai absorption, kūʻē i ka hiki ke komo i loko o kahi hana o ka uhi ʻana i ka mānoanoa a me ka uhi ʻana ma lalo o nā kūlana like. Ua hōʻike ʻia ka noiʻi ʻana e hoʻokumu ʻia ka resin epoxy cross-linked i kekahi nui o nā pore a me nā kahawai pore no nā mole wai i loko o ka resin epoxy. Hiki i ka hopena i ka uhi / metala interface, mai ka tunnel i loko o ka corrosion huahana kiʻi i hana ʻia ma ke kikowaena me ka metala pane, kēia papa o ka corrosion huahana kiʻiʻoniʻoni e pale aku i ka hopena o ka metala a me ka hoʻonā ʻana, e emi mālie ka pale pale. Me ka nui aʻe o nā ion corrosive i hiki i ka interface, ua luku ʻia kēia ʻāpana o ke kiʻi ʻoniʻoni corrosion, hoʻoikaika ʻia ka corrosive, a i ka hopena i ka hoʻopau ʻia ʻana o ka uhi epoxy mai ka pahu. ʻO ka Fusion bonded epoxy powder coatings i hoʻōla ʻia he waiwai mau i ka ether a me nā pūʻulu hydroxyl, kēia mau pūʻulu ikaika a me ka ʻili paipu i hoʻopaʻa paʻa ʻia e nā paʻa kemika e hana i ka uhi anti-corrosion. E hoʻopiha i ka waha o ka uhi ʻana, paʻa, pinhole kumu, ʻo ka uhi ʻana he mau degere like ʻole o ka absorption wai a me ka permeability, inā ʻoi aku ka nui o ka pale cathodic, ka hopena i ka cathodic hydrogen evolution, me ka ikaika hydrogen atoms o ka hōʻiliʻili, i kekahi ʻano. , hydrogen e ether a me ka hopena hydroxyl, a laila e hoʻohaʻahaʻa i ka ikaika paʻa o ka uhi a me ka paipu kila, e hopena i ka nalowale o ka ikaika pili. ʻO ka hopena, ʻo ka uhi ʻana mai ka paipu kila.