Palena Galvanized
Paʻa ka Zinc i ka ea maloʻo a ʻaʻole maʻalahi ke hoʻololi i ke kala.I loko o ka wai a me ka lewa haʻahaʻa, hana ia me ka oxygen a i ʻole carbon dioxide e hana i ka oxide a i ʻole alkaline zinc carbonate film, hiki ke pale i ka zinc mai ka hoʻomau ʻana i ka oxidized a pāʻani i kahi hana pale.
Hiki ke maʻalahi ka Zinc i ka corrosion i nā waikawa, alkalis a me nā sulfides.ʻO ka papa galvanized ka maʻamau passivated.Ma hope o ka passivation i loko o ka chromic acid a i ʻole ka hopena chromate, ʻaʻole maʻalahi ke kiʻi passivation i hana ʻia me ka ea maʻemaʻe, a ua hoʻonui nui ʻia ka mana anti-corrosion.No nā ʻāpana puna, nā ʻāpana pā lahilahi (ka mānoanoa o ka paia < 0.5m) a me nā ʻāpana kila e koi ana i ka ikaika mechanical kiʻekiʻe, pono e lawe ʻia ka hoʻoneʻe hydrogen, a ʻaʻole hiki ke wehe ʻia nā ʻāpana keleawe a me ke keleawe.
ʻAʻole maikaʻi ka mana maʻamau o ka zinc, no laila ʻo ka uhi zinc he uhi anodic no nā metala he nui.
Noi: Hoʻohana maʻamau ka galvanizing i nā kūlana lewa a me nā kaiapuni maikaʻi ʻē aʻe.Akā ʻaʻole no nā ʻāpana friction.
Hoʻopili Cadmium
ʻO nā ʻāpana e pili ana me ka lewa moana a i ʻole ka wai kai a me ka wai wela ma luna o 70 ℃, paʻa ka paʻa o ka cadmium coating, ikaika ka corrosion resistance, lubricity maikaʻi, hoʻoheheʻe lohi i ka waika hydrochloric dilute, akā maʻalahi loa e hoʻoheheʻe i ka waikawa nitric.ʻAʻole hiki ke hoʻoheheʻe ʻia i loko o ka wai.
ʻOi aku ka palupalu o ka cadmium coating ma mua o ka zinc coating, ʻoi aku ka liʻiliʻi o ka hydrogen embrittlement o ka uhi, a ikaika ka adhesion, a ma lalo o kekahi mau kūlana electrolytic, ʻoi aku ka nani o ka uhi cadmium i loaʻa ma mua o ka zinc coating.Akā ʻo ke kinoea i hoʻoheheʻe ʻia i ka wā e hoʻoheheʻe ai ka cadmium he mea ʻawaʻawa, a ʻo ka paʻakai cadmium hiki ke hoʻoheheʻe ʻia he mea ʻawaʻawa.Ma lalo o nā kūlana maʻamau, cadmium he cathodic coating ma ke kila a me ka anodic coating i loko o ka moana a me ke kiʻekiʻe wela ea.
Hoʻohana: Hoʻohana nui ʻia ia e pale i nā ʻāpana mai ka ʻino ʻana o ka lewa o ka wai kai a i ʻole nā paʻakai paʻakai like a me ka mahu wai kai piha.Nui nā ʻāpana mokulele, moana a me nā ʻenehana uila, nā pūnāwai, a me nā ʻāpana kaula i uhi ʻia me ka cadmium.Hiki ke hoʻomaʻamaʻa ʻia, phosphatized a hoʻohana ʻia e like me ke kumu pena, akā ʻaʻole hiki ke hoʻohana ʻia e like me ka papa ʻaina.
Palena Chrome
Paʻa loa ka Chromium i ka lewa haʻahaʻa, alkali, nitric acid, sulfide, carbonate solutions and organic acids, a hiki ke hoʻoheheʻe ʻia i loko o ka waika hydrochloric a me ka waikawa sulfuric concentrated wela.
Ma lalo o ka hana o ke au pololei, inā hoʻohana ʻia ka ʻāpana chromium e like me ka anode, hiki ke hoʻoheheʻe ʻia i loko o ka hopena caustic soda.
ʻO ka papa chromium ka ikaika adhesion, ka paʻakikī kiʻekiʻe, 800 ~ 1000V, ke kūpaʻa maikaʻi i ka lole, ka hoʻomaʻamaʻa māmā ikaika, a me ke kūpaʻa wela kiʻekiʻe.Ua emi loa.ʻO ka hemahema o ka chromium, ʻo ia ka paʻakikī, palupalu a maʻalahi hoʻi e hāʻule i lalo, ʻoi aku ka ʻike i ka wā e kau ʻia ai i nā haʻalulu haʻalulu.
I ka manawa like, porous ka chrome.Hoʻololi maʻalahi ka chromium metala i ka lewa e hana i kahi kiʻi passivation, pēlā e hoʻololi ai i ka hiki o ka chromium.No laila, lilo ʻo Chromium ma ka hao i uhi cathodic.
Hoʻohana: ʻAʻole kūpono ia e pā pololei i ka chrome ma ka ʻili o nā ʻāpana kila ma ke ʻano he anti-corrosion layer.ʻO ka mea maʻamau, hiki ke hoʻokō i ke kumu o ka pale ʻana a me ka hoʻonaninani ʻana i ka multi-layer electroplating (ie copper plating → nickel → chromium).I kēia manawa, hoʻohana nui ʻia ia i ka hoʻomaikaʻi ʻana i ka pale ʻana o nā ʻāpana, ka hoʻoponopono ʻana i nā ana, ka noʻonoʻo māmā a me nā kukui hoʻonaninani.
Hoʻopalapala nikela
He kūpaʻa kemika maikaʻi ʻo Nickel i ka lewa a me ka lye, ʻaʻole maʻalahi ke hoʻololi i ke kala, a hoʻokahe wale ʻia ke ʻoi aku ka mahana ma luna o 600°C.E hoʻoheheʻe mālie ʻia i loko o ka ʻakika sulfuric a me ka waika hydrochloric, akā hiki ke hoʻoheheʻe ʻia i ka waika nitric dilute.He maʻalahi ka passivate i loko o ka waika nitric concentrated a no laila ke kūpaʻa maikaʻi i ka corrosion.
He paʻakikī ka hoʻopaʻa ʻana i ka Nickel, maʻalahi ke hoʻoliʻiliʻi, he kiʻekiʻe ka mālamalama māmā a hoʻohui i nā mea nani.ʻO kona pōʻino ʻo kona porosity, i mea e lanakila ai i kēia hemahema, hiki ke hoʻohana ʻia i ka pā metala multi-layer, a ʻo ka nickel ka papa waena.ʻO Nickel kahi uhi cathodic no ka hao a me kahi uhi anodic no ke keleawe.
Hoʻohana: Hoʻohana pinepine ʻia e pale i ka corrosion a hoʻonui i ka aesthetics, no laila hoʻohana maʻamau ia e pale i nā uhi hoʻonaninani.He mea kūpono ka hoʻopaʻa ʻana i ka nickel ma nā huahana keleawe no ka anti-corrosion, akā no ka mea ʻoi aku ka pipiʻi o ka nickel, hoʻohana pinepine ʻia nā alloy copper-tin ma kahi o ka nickel-plating.
Ka manawa hoʻouna: Oct-11-2022