Anti-corrosion epoxy powder coating inotamba basa rekudzivirira

Iko kushandiswa kwakabatana kwe cathodic kuchengetedza uye corrosion kudzivirira layer, inobvumira pasi pevhu kana pasi pemvura simbi chimiro kuti uwane yakanyanya hupfumi uye inoshanda dziviriro. Kazhinji yakaputirwa nejasi rekudzivirira risati rashandiswa, kune simbi uye dielectric nharaunda magetsi ekudzivirira ega, kupfekedza kwakanaka kunogona kudzivirira kupfuura 99% yezvimiro zvekunze kwekunze kubva mukuora. Iyo pombi yekuputira mukugadzira, yekufambisa uye yekuvaka, haigone kuvimbisa zvachose kurwisa chero kukuvadza kune (kuzadza muromo kuvharika, iyo coating density, coating pinhole, etc.), hazvigoneke kuti pombi yecorrosion nharaunda yakaparadzaniswa zvachose. Asi zvakare ye-anti-corrosion insulation layer yezvakasiyana zvinhu, mumadhigirii akasiyana, inonwisa uye inofema, uye zvishoma nezvishoma inovigwa inonyudza. Kuti uchengetedze inobudirira anti-corrosion, zvinodikanwa kutora kuchengetedzwa kwecathodic ndiko, kuchengetedzwa kwekubatana. Makobvu machira (ukobvu> 1mm), pombi yekubatanidza yekudzivirira inofanirwa kusarudzwa inodzivirira inogona kubva -1.10 kusvika-1.15V (CSE), iyo yakatetepa coating (ukobvu ≤ 1mm) inotora simba rekudzivirira re -1.05 kusvika-1.10V (CSE), Tichifunga nezve kuumbwa kwevhu, humidity, tembiricha, mhando dzekuputira, kunaka kwekuputira, pamwe nehutachiona, gadziriso dzakakodzera kune inogoneka yekudzivirira, zvese kuchengetedza pombi pasina kuparadza anti-corrosion coating. Iyo corrosion yepolarization ikozvino yekuongorora nharaunda inoshanda zvakanyanya. "Kudzivirirwa" ipfungwa yakakosha pano, iyo anti-corrosion epoxy powder coating panzvimbo, “dziviriro”?

Iyo yakavharwa yekubvisa cathode yejasi, zvinoparadza, iyo chaiyo yakavigwa simbi pombi kuti imhanye yakanakisa kudzivirira yakasarudzwa cathodic kudzivirira coating (3PE coating, iyo iri pasi pekubatana yakasungirirwa epoxy powder) kubva pazvikonzero zvakakosha kuongorora. Nezve yakanakisa kudzivirira kugona. Ikozvino-inogoneka curve muvadzidzi vekune dzimwe nyika vanodzidza kukora uye cathodic kuchengetedza mamiriro, yakanyanya hydrogen desorption reaction inogoneka ye-1.15V. Zvinoenderana nekuferefeta Malaysia, Lloyd's Register, Shell inopa yakanyanya kudzivirira inogona ye-1.1V muganho kutora-1.15V; Muyero weGerman DIN30676-19853.1 unoverenga seizvi: mune yakaonda coating (<1mm) gobvu yakashandiswa kudzivirira ngura nyaya yacho, nekuda kweiyo polarization ichave nemhedzisiro inopesana senge mablister akaumbwa, kuti aderedze kukanganisa, anofanirwa kudzikisira chiyero chesimba rekudzivirira sebasa rekuvhara, senge yakanyanya kudzivirira inogona -1.00 ~~-1.20V (hama CSE) . Kunze kwenyika, yakanyatso taura chikonzero chinogona kukonzera kukundikana kwekuputirwa nezvinhu zvakati wandei, zvinosanganisira kuumbwa kwevhu, humidity, tembiricha, marudzi ekuputira, kunaka kwekupotera uye microbial, iyo indasitiri gene.rally inofungidzirwa kudzivirira simba rinogona kupera rakarasika -1.05 ~ - 1.10V (CSE) (Cherechedza: kushandiswa kwakapararira kwe fusion bonded epoxy powder coating). Cathodic kudzivirira lead coating (3PE inovhara pazasi kubva pamaitiro e fusion yakasungirirwa epoxy poda coating).

Coating type, humidity, tembiricha inosarudza kuvharwa kwemvura kunyura, kuramba kugona kupinda mukati mekuita basa rekuvhara ukobvu uye kupfeka pasi pemamiriro akafanana. Tsvagiridzo yakaratidza kuti muchinjika-yakabatana epoxy resin inoumba imwe huwandu hwepore uye pore nzira dzemamorekuru emvura muepoxy resin. Solution inosvika pakuputira / simbi interface, kubva mumugero uchipinda mune corrosion chigadzirwa firimu inogadzirwa painterface ine simbi reaction, iyi dhizaini yecorrosion chigadzirwa firimu kudzivirira kuita kwesimbi uye mhinduro, iyo yekupotera inodzikira zvishoma nezvishoma. Nemaion akawanda uye anowedzera corrosion anosvika painterface, iyi layer yecorrosion product film inoparadzwa zvishoma nezvishoma, kuonda kunowedzera, uye pakupedzisira kunokonzeresa epoxy coating kubviswa kubva padhiramu. Fusion bonded epoxy poda coatings yakarapwa ichiri kupfuma mumapoka ether uye hydroxyl, aya mapoka anoshanda uye pombi yepamusoro yakanyatso sunganidzwa pamwechete nemakemikari zvisungo kuita anti-corrosion coating. Zadza muromo wejasi, dense, pinhole zvikonzero, iko kupfekedza kwakasiyana madhigirii ekunyura kwemvura uye kupera, kana kuchengetedzwa kwecathodic kwakanyanya, zvichikonzera kushanduka kwecathodic hydrogen, nemaatomu ehydrogen anoshanda eiyo yakaunganidzwa, kusvika pamwero wakati. , hydrogen ichaita ether uye hydroxyl reaction, nekudaro inokanganisa kusimba kwechisungo chekuputira uye pombi yesimbi, zvichikonzera kupera kwesimba rebhondi. Mhedzisiro ndeyokuti iyo yekupfekedza kubva paipi yesimbi.