Galvanizing
Nā hiʻohiʻona:
Paʻa paʻa ka Zinc i ka ea maloʻo a ʻaʻole hiki ke hoʻoneʻe ʻia. I loko o ka wai a me ka haʻahaʻa, hoʻololi ia me ka oxygen a i ʻole carbon dioxide e hana i nā kiʻiʻoniʻoni oxide a alkaline zinc carbonate, hiki ke pale i ka zinc mai ka hoʻomau ʻana i ka oxidize a hāʻawi i ka pale.
Hiki loa i ka Zinc ke hoʻopōʻino i nā waikawa, alkalis, a me nā sulfides. Pono ka papa galvanized e hana i ka lapaʻau passivation. Ma hope o ka passivation i loko o ka chromic acid a i ʻole ka hopena chromate, ʻaʻole maʻalahi ka ʻike ʻia o ka kiʻi passivation i hana ʻia i ka ea haʻahaʻa, e hoʻonui nui ana i kona hiki anti-corrosion. No nā ʻāpana puna, nā ʻāpana pā lahilahi (ka mānoanoa o ka paia<0.5m), a me nā ʻāpana kila e koi ai i ka ikaika mechanical kiʻekiʻe, pono e lawe ʻia ka hoʻohemo ʻana o ka hydrogen, ʻoiai ʻaʻole pono nā ʻāpana keleawe a me ke keleawe i ka wehe ʻana i ka hydrogen.
He haʻahaʻa ke kumu kūʻai o Galvanizing, hana maʻalahi, a me ka hopena maikaʻi. ʻAʻole maikaʻi ka mana maʻamau o ka zinc, no laila ʻo ka uhi zinc he uhi anodic no nā metala he nui.
Hoʻohana nui ʻia ka Galvanization i nā kūlana lewa a me nā wahi ʻē aʻe. Akā ʻaʻole kūpono ia no ka hoʻohana ʻana ma ke ʻano he ʻāpana friction.
Chrome plating
Nā ʻano: No nā ʻāpana e pili ana i ka lewa moana a i ʻole ka wai kai, a me ka wai wela ma luna o 70℃, cadmium plating mea paʻa, he ikaika corrosion kū'ē, maikaʻi lubrication, a hoʻoheheʻe lohi i dilute hydrochloricʻakika, akā, ua loa hiki ke hoʻoheheʻe 'ia i loko o ka nitric waika a me ka insoluble i ka alkali. ʻAʻole hiki ke hoʻoheheʻe ʻia kona oxide i ka wai. ʻOi aku ka palupalu o ka uhi Cadmium ma mua o ka uhi zinc, me ka liʻiliʻi o ka hydrogen embrittlement a me ka hoʻopili ikaika.
Eia kekahi, ma lalo o kekahi mau kūlana electrolytic, ʻoi aku ka maikaʻi o ka uhi cadmium i loaʻa ma mua o ka uhi zinc. Akā ʻo ke kinoea i hana ʻia e ka cadmium i ka wā e hoʻoheheʻe ai he mea ʻawaʻawa, a ʻo nā paʻakai cadmium hiki ke hoʻoheheʻe ʻia he mea ʻawaʻawa. Ma lalo o nā kūlana maʻamau, hana ka cadmium ma ke ʻano he cathodic coating ma ke kila a ma ke ʻano he anodic coating i ka moana moana a me ka wela wela.
Hoʻohana nui ʻia ia e pale i nā ʻāpana mai ka ʻino o ka lewa i hoʻokumu ʻia e ka wai kai a i ʻole nā hopena paʻakai like, a me ka mahu wai kai piha. Nui nā ʻāpana o ka mokulele, moana, a me nā ʻoihana uila, nā pūnāwai, a me nā ʻāpana threaded i uhi ʻia me ka cadmium. Hiki ke hoʻonaniʻia, phosphated, a hoʻohanaʻia ma keʻano he kumu pena, akā,ʻaʻole hiki ke hoʻohanaʻia e like me ka ipu.
Hoʻopili Chromium
'ano:
Paʻa loa ʻo Chromium i nā ea ea, alkaline, nitric acid, sulfide, carbonate solutions, a me nā ʻakika organik, 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 he anode ka papa chromium, hiki ke hoʻoheheʻe ʻia i loko o ka hopena caustic soda.
ʻO ka papa chromium he paʻa ikaika, paʻakikī kiʻekiʻe, 800-1000V, kūpaʻa maikaʻi i ka lole, ka noʻonoʻo māmā ikaika, a me ke kūpaʻa wela kiʻekiʻe. ʻAʻole ia e hoʻololi i ke kala ma lalo o 480℃, hoʻomaka e oxidize ma luna o 500℃, a hoemi loa i ka paakiki ma 700℃. ʻO kona hemahema, ʻo ia ka paʻakikī, palupalu, a hiki ke hoʻokaʻawale ʻia, ʻoi aku hoʻi ke kau ʻia i nā ukana hopena. A he porosity kona.
Hiki i ka metala Chromium ke hele i ka passivation i ka ea, ka hopena i ke kūkulu ʻana i kahi kiʻi passivation a pēlā e hoʻololi ai i ka hiki o ka chromium. No laila, lilo ka chromium i uhi cathodic ma ka hao.
ʻAʻole kūpono ke hoʻopili pololei i ka chrome plating ma ke ʻano he anti-corrosion layer ma ka ʻili o nā ʻāpana kila. ʻO ka mea maʻamau, ʻo ka hoʻoheheʻe ʻana i nā ʻāpana he nui (ʻo ia hoʻi ka hoʻoheheʻe keleawe→nickel plating→chromium plating) pono e hoʻokō i ke kumu o ka ʻōpala
ka pale ʻana a me ka hoʻonaninani. Hoʻohana nui ʻia i kēia manawa 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
'ano:
Loaʻa i ka Nickel ke kūpaʻa kemika maikaʻi i ka lewa a me ka hopena alkaline, ʻaʻole maʻalahi ka hoʻoneʻe ʻana, a ua oxidized wale ʻia ma nā mahana ma luna o 600.° C. Hoʻoheheʻe mālie ia i loko o ka ʻakika sulfuric a me ka waika hydrochloric, akā hiki ke hoʻoheheʻe ʻia i ka waika nitric dilute. Hoʻopili maʻalahi ʻia i loko o ka waika nitric concentrated a no laila ke kūpaʻa maikaʻi i ka corrosion.
ʻO ka Nickel plating he paʻakikī kiʻekiʻe, he maʻalahi ka poni, he kiʻekiʻe ka mālamalama māmā, a hiki ke hoʻonui i ka nani. ʻO kona hemahema ʻo ia ka porosity. No ka lanakila ʻana i kēia pōʻino, hiki ke hoʻohana ʻia nā uhi metala multi-layer, me ka nickel ka papa waena.
ʻO Nickel kahi uhi cathodic no ka hao a me kahi uhi anodic no ke keleawe.
Hoʻohana maʻamau ia no ka pale ʻana i nā mea hoʻonaninani i mea e pale ai i ka corrosion a hoʻonui i ka hoʻopiʻi nani. He mea kūpono ka hoʻopaʻa ʻana i ka nickel ma nā huahana keleawe no ka pale ʻana i ka corrosion, akā ma muli o ka waiwai kiʻekiʻe o ka nickel, hoʻohana pinepine ʻia nā ʻāpana keleawe keleawe ma kahi o ka nickel plating.
Ka manawa hoʻouna: Nov-14-2024
