ʻO ka Anodizing kahi hana i hoʻohana ʻia e hana i kahi kiʻiʻoniʻoni alumini oxide ma ka ʻili o nā huahana alumini a alumini paha. Hoʻokomo ia i ka hoʻokomo ʻana i ka huahana alumini a alumini paha ma ke ʻano he anode i loko o kahi hopena electrolyte a me ka hoʻopili ʻana i ka uila e hana i ke kiʻi ʻoniʻoni alumini oxide. Hoʻomaikaʻi ʻo Anodizing i ka pale ʻana i ka corrosion, ke kūpaʻa ʻaʻahu, a me nā mea hoʻonaninani o nā profile alumini. I ka wā o ke kaʻina hana anodizing o nā profile alumini, hiki ke loaʻa kekahi mau hiʻohiʻona maʻamau. E hoʻomaopopo mua kākou i nā kumu o nā hemahema kikoʻī. ʻO ka ʻinoʻino, ka ʻauʻau ʻauʻau, ka ua o nā ʻāpana lua, a i ʻole nā hopena galvanic hiki ke alakaʻi i nā hemahema. Ua wehewehe ʻia lākou penei:
1.Acid a alkali etching
Ma mua o ka anodizing, hiki ke ʻino ʻia ka mea alumini e ka waikawa a i ʻole ka wai alkaline, a i ʻole e hoʻopili ʻia e ka ʻakika a i ʻole ka uahi alkaline, e hopena i nā kiko keʻokeʻo kūloko ma ka ʻili. Inā paʻakikī ka ʻinoʻino, hiki ke puka mai nā wahi lua nui. He mea paʻakikī ke hoʻoholo me ka maka ʻike ʻole inā he waika a alkali paha ke kumu o ka corrosion, akā hiki ke ʻike maʻalahi ʻia ma ka nānā ʻana i ka ʻāpana keʻa o ka wahi i ʻino ʻia ma lalo o kahi microscope. Inā poepoe ka lalo o ka lua a me ka ʻole o ka corrosion intergranular, ma muli o ka etching alkali. Inā ʻaʻole maʻamau ka lalo a hele pū me ka corrosion intergranular, me nā lua hohonu, ma muli o ka etching acid. ʻO ka mālama pono ʻole a me ka mālama ʻana i ka hale hana hiki ke alakaʻi i kēia ʻano ʻino. ʻO ka uahi ʻakika mai nā mea hoʻoliʻiliʻi kemika a i ʻole nā huhū ʻakika ʻē aʻe, a me nā mea hoʻomaʻemaʻe organik chlorinated, nā kumu o ka etching acid. Hoʻopili ʻia ka etching alkali maʻamau ma muli o ka hoʻopuehu ʻana a me ka paʻi ʻana o ka mortar, lehu sima, a me ka wai holoi alkaline. Ke hoʻoholo ʻia ke kumu, hiki i ka hoʻoikaika ʻana i ka hoʻokele o nā kaʻina hana like ʻole i ka hale hana ke hoʻoponopono i ka pilikia.
2.Atmospheric corrosion
Hiki i nā kiʻi alumini i ʻike ʻia i ka ea haʻahaʻa ke hoʻomohala i nā kiko keʻokeʻo, e hoʻolike pinepine i ka longitudinally ma nā laina poni. ʻAʻole ʻoi aku ka paʻakikī o ka corrosion atmospheric e like me ka acid a alkali etching a hiki ke hoʻoneʻe ʻia e nā ʻano mechanical a i ʻole ka holoi alkaline. ʻAʻole i ʻike ʻia ka ʻino o ka lewa a hiki ke hana ma kekahi mau ʻili, e like me nā wahi haʻahaʻa haʻahaʻa kahi e hoʻopaʻa maʻalahi ai ka mahu wai a i ʻole ma luna. Ke ʻoi aku ka koʻikoʻi o ka ʻinoʻino o ka lewa, ʻike ʻia ka ʻāpana keʻa o nā lua e like me nā halo hoʻohuli. I kēia hihia, ʻaʻole hiki i ka holoi alkaline ke hoʻopau i nā wahi lua a hiki ke hoʻonui iā lākou. Inā hoʻoholo ʻia ka corrosion atmospheric, pono e nānā ʻia nā kūlana mālama i ka hale hana. ʻAʻole pono e mālama ʻia nā mea alumini ma nā wahi me ka haʻahaʻa haʻahaʻa loa e pale ai i ka condensation o ka wai. Pono e maloʻo ka wahi e waiho ai, a ʻo ka mahana e like me ka hiki.
3.Pepa ʻino (nā kiko wai)
Ke waiho ʻia ka pepa a i ʻole ka pahu pahu ma waena o nā mea alumini a hoʻohana ʻia no ka hoʻopili ʻana, pale ia i ka abrasion. Eia naʻe, inā pulu ka pepa, ʻike ʻia nā kiko ʻino ma ka ʻili o ka alumini. Ke hoʻohana ʻia ka pahu corrugated, ʻike ʻia nā laina maʻamau o nā wahi corrosion ma nā wahi e pili ana me ka papa corrugated. ʻOiai ʻike ʻia nā hemahema i kekahi manawa ma ka ʻili alumini, ʻoi aku ka nui o ka ʻōlelo ʻana ma hope o ka holoi ʻana a me ka anodizing alkaline. He hohonu kēia mau kiko a paʻakikī ke wehe ʻia e ka mīkini holoi a i ʻole ka holoi alkaline. Hoʻokumu ʻia ka ʻino o ka pepa (papa) e nā ion acid, ka nui o SO42- a me Cl-, aia i loko o ka pepa. No laila, ʻo ka hoʻohana ʻana i ka pepa (papa) me ka ʻole o ka chlorides a me ka sulfates a me ka pale ʻana i ke komo ʻana o ka wai, he mau ala kūpono ia e pale ai i ka ʻino pepa (papa).
4. Hoʻomaʻemaʻe wai ʻino (ʻike pū ʻia ʻo snowflake corrosion)
Ma hope o ka holoi ʻana i ka alkaline, ka poni kemika, a i ʻole ka sulfuric acid pickling, inā loaʻa i ka wai holoi ʻana i nā haumia, hiki ke hopena i nā kiko hoku a i ʻole ʻālohilohi ma ka ʻili. He pāpaʻu ka hohonu o ka ʻino. Hana ʻia kēia ʻano ʻino i ka wā i haumia nui ai ka wai hoʻomaʻemaʻe a i ʻole ka haʻahaʻa o ke kahe o ka holoi ʻana. Ua like ia me nā ʻano kristal hau i ka nānā aku, no laila ka inoa ʻo "snowflake corrosion." ʻO ke kumu ka hopena ma waena o nā haumia o ka zinc i loko o ka alumini a me ka SO42- a me Cl- i ka wai hoʻomaʻemaʻe. Inā maikaʻi ʻole ka insulation o ka pahu, hiki i nā hopena galvanic ke hoʻonui i kēia hemahema. Wahi a nā kumu haole, inā ʻoi aku ka nui o ka Zn i loko o ke alumini alumini ma mua o 0.015%, ʻoi aku ka nui o ka Cl- i ka wai hoʻomaʻemaʻe ma mua o 15 ppm, hiki ke hana ʻia kēia ʻano corrosion. ʻO ka hoʻohana ʻana i ka waikawa nitric no ka pickling a i ʻole ka hoʻohui ʻana i ka 0.1% HNO3 i ka wai hoʻomaʻemaʻe hiki ke hoʻopau iā ia.
5.Chloride corrosion
ʻO ka loaʻa ʻana o kahi chloride liʻiliʻi i loko o ka ʻauʻau anodizing sulfuric acid hiki ke alakaʻi i ka corrosion pitting. ʻO ka hiʻohiʻona hiʻohiʻona he mau lua hoku ʻeleʻele hohonu, ʻoi aku ka nui o ka paʻa ma nā kihi a me nā kihi o ka mea hana a i ʻole ma nā wahi ʻē aʻe me nā kiʻekiʻe o kēia manawa. ʻAʻohe kiʻi anodized nā wahi lua, a ʻoi aku ka liʻiliʻi o ka mānoanoa o ke kiʻi ma nā wahi "maʻamau" i koe ma mua o ka waiwai i manaʻo ʻia. ʻO ke kiʻekiʻe o ka paʻakai i loko o ka wai paipu ke kumu nui o Cl- pollution i loko o ka ʻauʻau.
6.Galvanic corrosion
I loko o kahi pahu i hoʻoikaika ʻia (anodizing a i ʻole kala electrolytic), hiki i nā hopena galvanic ma waena o ka mea hana a me ka pahu (pahu kila), a i ʻole nā hopena o ke au ʻauheʻe i loko o kahi pahu wai ikaika ʻole (holoi a hoʻopaʻa ʻia paha), hiki ke hōʻeha a hoʻonui i ka ʻinoʻino.
Hoʻoponopono ʻia e May Jiang mai MAT Aluminum
Ka manawa hoʻouna: Dec-15-2023
