Nā ʻokoʻa o ka Galvanizing, Cadmium Plating, Chromium Plating, a me Nickel Plating of Steel Pipe Round Steel

He aha nā ʻokoʻa ma waena o ka hoʻoheheʻe zinc, ka hoʻopalapala cadmium, ka hoʻoheheʻe chromium, a me ka hoʻoheheʻe nickel o ka paipu kila akila bar?

1.ʻO ka hoʻoulu ʻana

Nā hiʻohiʻona: Paʻa paʻa ka Zinc i ka ea maloʻo a ʻaʻole hiki ke hoʻoneʻe ʻia.I loko o ka wai a me ka hau hau, hoʻopili ia me ka oxygen a i ʻole carbon dioxide e hana i nā oxides a i ʻole alkaline zinc carbonate films, hiki ke pale i ka zinc mai ka hoʻomau ʻana i ka oxidize a pāʻani i kahi kuleana pale. ʻO Zinc ka mea maʻalahi loa i ka corrosion i nā waikawa, alkalis, a me sulfides.Hoʻomaʻamaʻa pinepine ʻia nā pale galvanized.Ma hope o ka passivation i loko o ka chromic acid a i ʻole ka hopena chromate, ʻaʻole maʻalahi ka hopena o ke kiʻi passivation i hana ʻia e ka ea haʻahaʻa, hoʻonui nui i kona hiki ke 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.ʻO ka Zinc plating he haʻahaʻa haʻahaʻa, hana maʻalahi, a me nā hopena maikaʻi.ʻAʻole maikaʻi ka mana maʻamau o ka zinc, no laila ʻo ka zinc plating he uhi anodic ma nā metala he nui.Hoʻohana: Hoʻohana nui ʻia ka Galvanizing i nā kūlana lewa a me nā wahi maikaʻi ʻē aʻe.Akā ʻaʻole pono e hoʻohana ʻia ma ke ʻano he ʻāpana friction

2.Cadmium hoʻopili

Nā hiʻohiʻona: No nā ʻāpana e pili ana i ka lewa moana a i ʻole ka wai kai, a i ka wai wela ma luna o 70 ℃, paʻa ka paʻa ʻana o ka cadmium plating, ikaika ke kūpaʻa corrosion, lubrication maikaʻi, a hoʻoheheʻe mālie i ka waika hydrochloric dilute.Eia nō naʻe, hiki ke hoʻoheheʻe ʻia i loko o ka waikawa nitric, hiki ʻole ke hoʻoheheʻe ʻia i ka alkali, a ʻaʻole hiki ke hoʻoheheʻe ʻia i ka wai.ʻOi aku ka palupalu o ka uhi Cadmium ma mua o ka uhi zinc, me ka liʻiliʻi o ka hydrogen brittleness a me ka pili ikaika.Eia kekahi, ma lalo o kekahi mau kūlana electrolysis, ʻoi aku ka nani 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, ʻo ka cadmium he cathodic coating ma ke kila, a he anodic coating i loko o ka moana a me nā ea wela kiʻekiʻe.Hoʻohana: 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, hoʻokele, a me nā ʻoihana uila, nā pūnāwai, a me nā ʻāpana threaded i uhi ʻia me ka cadmium.Hiki ke hoʻomaʻamaʻa ʻia, phosphated, a hoʻohana ʻia ma ke ʻano he substrate pena, akā ʻaʻole hiki ke hoʻohana ʻia e like me ka papa ʻaina.

3.Hoʻopili Chrome

ʻAno: Paʻa loa ʻo Chromium i nā ea hau, 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 hoʻohana ʻia ka papa chromium ma ke ʻano he anode, 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 ka waihoʻoluʻu ma lalo o 480 ℃, hoʻomaka e oxidize ma luna o 500 ℃, a hoʻemi nui i ka paʻakikī ma 700 ℃.ʻO kona hemahema, ʻo ia ka paʻakikī o ka chromium, palupalu, a hiki ke hoʻokaʻawale ʻia, ʻoi aku ka nui o ka ʻōlelo ʻana i ka wā e hoʻokau ʻia ana i nā ukana hopena.A he porosity kona.Hoʻopili maʻalahi ka chromium metala i ka ea e hana i kahi kiʻi passivation, no laila e hoʻololi i ka hiki o ka chromium.No laila, lilo ka chromium i uhi cathodic ma ka hao.Noi: ʻAʻole kūpono ka hoʻopili pololei ʻana i ka chromium ma ka ʻili o nā ʻāpana kila ma ke ʻano he anti-corrosion layer, a loaʻa maʻamau ma o ka multi-layer electroplating (ʻo ia hoʻi, ka pā keleawe → nickel → chromium) e hoʻokō i ke kumu o ka pale ʻana a me ka hoʻonaninani.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.

nickel plating

Nā hiʻohiʻona: Loaʻa i ka Nickel ke kūpaʻa kemika maikaʻi i ka lewa a me ka hopena alkaline, ʻaʻole hiki ke hoʻokaʻawale ʻia, a ua hoʻoheheʻe wale ʻia ma nā mahana ma luna o 600 ° C. Hoʻoheheʻe mālie ia i ka waikawa sulfuric a me ka waikawa hydrochloric, akā hiki ke maʻalahi i ka waika nitric dilute.He mea maʻalahi ka passivate i loko o ka waika nitric concentrated a no laila he kūpaʻa maikaʻi ka corrosion.He kiʻekiʻe ka paʻakikī a maʻalahi ka hoʻohana ʻana i ka nickel coating.

Hou Gapower Metal Hoʻolaha ka ʻoihana i ka hoʻolako ʻana i nā chrome plated, galvanized, nickel plated steel pipes and round steels.He 20000 tona o na paipu kila poepoe ka hui.Hiki iā mākou ke hāʻawi i nā ʻano kikoʻī like ʻole o nā paipu kila, nā kaola pōʻai, nā paipu kila i hoʻomaʻamaʻa ʻia, a me nā kumu i kālai ʻia, me nā kūlana ʻAmelika, Kelemānia, Iapana, a me ʻEulopa.Welina mai e nīnau.