ʻO nā kaʻina hana nui o ka mālama ʻana i ka metal oxidation

ʻO ka hoʻomaʻamaʻa oxidation o nā metala ʻo ia ka hoʻokumu ʻana i kahi kiʻiʻoniʻoni oxide pale ma luna o ka ʻili o nā metala ma o ka launa pū ʻana me ka oxygen a i ʻole nā ​​mea oxidants, kahi e pale ai i ka corrosion metala. ʻO ke ʻano o ka hoʻoheheʻe ʻana e pili ana i ka thermal oxidation, alkaline oxidation, a me ka acidic oxidation

ʻO ka hoʻomaʻamaʻa oxidation o nā metala ʻo ia ka hoʻokumu ʻana i kahi kiʻiʻoniʻoni oxide pale ma luna o ka ʻili o nā metala ma o ka launa pū ʻana me ka oxygen a i ʻole nā ​​mea oxidants, kahi e pale ai i ka corrosion metala. ʻO ke ʻano o ka hoʻoheheʻe ʻana e pili ana i ka thermal oxidation, alkaline oxidation, acidic oxidation (no nā metala ʻeleʻele), oxidation kemika, anodic oxidation (no nā metala non-ferrous), etc.

E hoʻohana i nā huahana metala wela i ka 600 ℃ ~ 650 ℃ me ka hoʻohana ʻana i ke ʻano o ka thermal oxidation, a laila mālama iā lākou me ka mahu wela a me nā mea hōʻemi. ʻO kekahi ala ʻē aʻe ʻo ka hoʻoinu ʻana i nā huahana metala i loko o nā paʻakai metala alkali hoʻoheheʻe ʻia ma kahi o 300 ℃ no ka mālama ʻana.

Ke hoʻohana nei i ke ʻano o ka alkaline oxidation, e hoʻokomo i nā ʻāpana i loko o kahi hopena i hoʻomākaukau ʻia a wela iā lākou i 135 ℃ a 155 ℃. ʻO ka lōʻihi o ka mālama ʻana e pili ana i ka ʻike kalapona i nā ʻāpana. Ma hope o ka mālama ʻana i nā ʻāpana metala, holoi iā lākou me ka wai kopa i loaʻa ka 15g/L a 20g/L ma 60 ℃ a 80 ℃ no 2 a 5 mau minuke. A laila holoi iā lākou me ka wai anuanu a me ka wai wela a puhi maloʻo a maloʻo paha no 5 a 10 mau minuke (ma kahi mahana o 80 ℃ a 90 ℃).

ʻO ke ʻano oxidation acid 3 e pili ana i ka hoʻokomo ʻana i nā ʻāpana i loko o kahi hopena acidic no ka mālama ʻana. Ke hoʻohālikelike ʻia me ke ʻano o ka alkaline oxidation, ʻoi aku ka maikaʻi o ke ʻano o ka acidic oxidation. ʻO ke kiʻiʻoniʻoni pale i hana ʻia ma ka ʻili metala ma hope o ka mālama ʻana, ʻoi aku ka kiʻekiʻe o ke kūpaʻa corrosion a me ka ikaika mechanical ma mua o ke kiʻi ʻoniʻoni i hana ʻia ma hope o ka mālama ʻana i ka alkaline oxidation.

ʻO ke ʻano o ka oxidation kemika he mea kūpono ia no ka mālama ʻana i nā metala non-ferrous e like me ke aluminika, ke keleawe, ka magnesium, a me kā lākou mau ala. ʻO ke kaʻina hana ka waiho ʻana i nā ʻāpana i loko o kahi hopena i hoʻomākaukau ʻia, a ma hope o kahi hopena oxidation i kahi mahana no kekahi manawa, hana ʻia kahi kiʻi pale, a laila hiki ke hoʻomaʻemaʻe a maloʻo.

ʻO ke ʻano anodizing kekahi ala ʻē aʻe no ka oxidation o nā metala non-ferrous. ʻO ia ke kaʻina hana o ka hoʻohana ʻana i nā ʻāpana metala e like me nā anodes a me nā ʻano electrolytic e hana ai i nā kiʻiʻoniʻoni oxide ma ko lākou mau papa. Hiki i kēia ʻano kiʻi oxide ke lawelawe ma ke ʻano he kiʻi passivation ma waena o ka metala a me ke kiʻi ʻoniʻoni, a me ka hoʻonui ʻana i ka ikaika hoʻopaʻa ma waena o nā uhi a me nā metala, e hoʻemi i ke komo ʻana o ka wai, a pēlā e hoʻonui ai i ke ola lawelawe o nā uhi. Hoʻohana nui ʻia ia ma ka papa lalo o ka pena.