ʻO ka corrosion kahi decomposition pololei o ka alumini wela wela kapa ʻia ʻo pitting. Hoʻokumu ʻia ke kumu o ka corrosion i ka lawa ʻole o ke kūpaʻa kūlohelohe kūlohelohe o ka alumini. Ma kēia ʻaoʻao e ʻike ʻoe i ka ʻike e pili ana i nā ʻano maʻamau o ka corrosion, e pili ana i ka pale ʻana i ka corrosion o ka alumini a me nā hiʻohiʻona o nā kumu e hiki ai ke kumu ʻino o ka alumini.
ʻAno ʻino:
ʻO nā ʻano corrosion e ʻike pinepine ʻia:
Galvanic corrosion: Loaʻa i ka wā e hoʻopili ai ke alumini me nā metala hanohano, e like me ka hao.
Pitting corrosion: Loaʻa inā he aluminika i loko o nā wahi haʻahaʻa loa, pinepine me nā paʻakai i loaʻa (maʻamau i ka lepo a me ka lepo) a me nā wahi ʻaʻole hiki ke kahe ka wai mai ka metala. ʻO ka corrosion pitting ka mea maʻamau o ka corrosion ma luna o ka alumini.
ʻO ka pale ʻana o ka alumini:
ʻO ka pale ʻana i ka corrosion kahi hōʻailona o ke kiʻekiʻe o ke kūpaʻa o ka alumini i ka corrosion. Ke hoʻohālikelike ʻia i kekahi mau metala ʻē aʻe, ʻoi aku ka maikaʻi o ka alumini.
No ka ʻike hou aku, ua kuhikuhi ʻia ka corrosion o ka alumini ma ka kikoʻī ma ka ISO 9023.
Papa ʻOxide – pale ʻino maoli
Hiki ke manaʻo ʻia ka ʻāpana oxide ma ke ʻano he kiʻiʻoniʻoni pale i hana ʻia ma luna o ka alumini i ka wā e hoʻopili ai ka alumini me ka oxygen. Mālama kēia ʻāpana i ka ʻili alumini i ka ʻino i ka wā pōkole. Inā pilikia ka mechanical i ka papa oxide, e hoʻoponopono koke ia i mua o ka oxygen.
Inā mālama ʻia ka aluminika i loko o nā wahi me ka ʻole o ka hoʻololi ʻana o ka wela nui a lawe ʻia i kahi wahi maloʻo, kahi i hoʻopili maikaʻi ʻia ai ka metala, i hiki ʻole ai ke komo ʻana o ka wai i ka ʻili metala, hāʻawi ka papa o ka oxide i ka pale mai ka corrosion. Paʻa ka papa ʻokikene ma ka pae pH 4-9. Inā ʻike ʻia ka aluminika i nā wahi ʻakika loa a i ʻole ka alkaline loa ma waho o ka pae pH o 4-9, e hiki mai ana ka ʻino metala ikaika. No ka laʻana, hiki i ka waiʻona ke hoʻopōʻino i ka alumini ma kahi liʻiliʻi wale nō, inā ʻaʻole lākou i nā waikawa organik, akā hiki ke ʻino ʻino loa inā loaʻa ka formic acid i ka manawa like. Ua hōʻuluʻulu mākou i kahi papa inoa o ka hopena o nā kemika like ʻole i ka alumini.
I loko o ia iho, hiki ke manaʻo ʻia ke kaʻina hana i ka wā o ka hoʻokumu ʻana o ka papa oxide e like me ka corrosion o ka ʻili alumini. Pēlā nō, ʻo ka anodisation, nona ka manaʻo e hoʻonui i ke kūpaʻa corrosion o ka alumini, ʻo ia hoʻi kahi kaʻina corrosion, eia naʻe, aia ma lalo o nā kūlana i hoʻomalu ʻia.
