KA PONO O NA MEA HANA OLE

ʻO ke kila kila kahi huila o ka hao i loaʻa ma ka liʻiliʻi he 10.5% chromium. Hāʻawi kēia chromium i ke kūkulu ʻana i kahi ʻāpana ʻokikene lahilahi loa ma ka ʻili metala, ʻike ʻia hoʻi ʻo ka "passive layer" a hāʻawi i ke kila kila i kona ʻālohilohi kūʻokoʻa.
ʻO nā pale pasif e like me kēia e kōkua i ka pale ʻana i ka ʻino o nā ʻili metala a pēlā e hoʻomaikaʻi ai i ka pale ʻana i ka corrosion ma o ka hoʻonui ʻana i ka nui o ka chromium i loko o ke kila kila. Ma ka hoʻohui ʻana i nā mea e like me ka nickel a me ka molybdenum, hiki ke hoʻomohala ʻia nā ʻāpana kila stainless, e hāʻawi ana i ka metala i ʻoi aku ka maikaʻi o nā waiwai, e like me ka hoʻomaikaʻi ʻana i ka formability a me ke kūpaʻa ʻoi aʻe o ka corrosion.
ʻAʻole e ʻino nā huahana kila kila i hana ʻia e nā mea hana paipu kila ma nā kūlana "kūlohelohe" a i ʻole ka wai, no laila, hoʻohana mau ʻia nā mea ʻokiʻoki, nā poho, nā countertops, a me nā pā i hana ʻia me ke kila. Eia naʻe, he mea nui e hoʻomaopopo he "rustless" kēia mea a ʻaʻole "stainless" a no laila i kekahi mau hihia e hiki mai ka corrosion.

He aha ka mea hiki ke hoʻopōʻino i ke kila kuhiliʻole?
ʻO ka corrosion, ma kāna wehewehe maʻalahi, he hopena kemika e pili ana i ka pono o nā metala. Inā pili ka metala me kahi electrolyte, e like me ka wai, oxygen, lepo, a i ʻole metala ʻē aʻe, hiki ke hana ʻia kēia ʻano hopena kemika.
Nalo nā metala i nā electrons ma hope o ka hopena kemika a pēlā e nāwaliwali ai. A laila hiki ke maʻalahi i nā hopena kemika ʻē aʻe e hiki mai ana, hiki ke hana i nā ʻano like ʻole e like me ka corrosion, nā māwae, a me nā lua o ka mea a hiki i ka nāwaliwali o ka metala.
Hiki nō hoʻi ke hoʻomau ʻia ka corrosion, ʻo ia hoʻi i ka wā e hoʻomaka ai hiki ke paʻakikī ke hoʻōki. Hiki i kēia ke lilo ka metala i mea palupalu ke hiki i ka ʻino i kekahi pae a hiki ke hāʻule.

NA ANO O OLE O KA PONO I KA HANA OLE
ʻAi ʻaʻahu
ʻO ke ʻano corrosion maʻamau i hiki ke hoʻopili i ke kila kuhili ʻole a me nā metala ʻē aʻe i kapa ʻia ʻo ka corrosion like. ʻO kēia ka "ʻaʻahu" hoʻolaha o ka corrosion ma luna o ka ʻili o ka mea.
ʻO ka mea e mahalo ai, ʻike ʻia ʻo ia kekahi o nā ʻano "benign" o ka corrosion, ʻoiai hiki ke uhi i nā wahi nui o nā ʻili metala. ʻOiaʻiʻo, hiki ke ana ʻia kona hopena i ka hana o ka mea i hiki ke hōʻoia maʻalahi.

ʻAi ʻAha
Hiki ke paʻakikī ke wānana, ʻike, a me ka ʻokoʻa ʻana i ka lua ʻana, ʻo ia hoʻi, ua manaʻo pinepine ʻia ʻo ia kekahi o nā ʻano ʻino ʻino loa.
ʻO kēia kahi ʻano corrosion nui loa kahi i hoʻokumu ʻia ai kahi wahi liʻiliʻi o ka pitting corrosion e kahi anodic a i ʻole cathodic wahi. Ke hoʻokumu paʻa ʻia kēia lua, hiki iā ia ke "kūkulu" iā ia iho i hiki i kahi puka liʻiliʻi ke hana maʻalahi i kahi lua i hiki ke ʻano o nā ʻano like ʻole. "Hele pinepine" ka luaʻi ʻino i lalo a hiki ke pilikia loa no ka mea inā ʻaʻole mālama ʻia, ʻoiai inā he wahi liʻiliʻi ka hopena, hiki ke alakaʻi i ka hana ʻole o ka metala.

ʻAha ʻAha
ʻO ka corrosion ʻo Crevice kahi ʻano o ka ʻinoʻino kūloko i loaʻa mai kahi pōʻaiapili microscopic i loaʻa i nā ʻāpana metala ʻelua nā ʻāpana ion.
Ma nā wahi e like me nā mea holoi, nā kī, a me nā hui i liʻiliʻi ke kaʻa e hiki ai ke komo i nā mea ʻawaʻawa, e hiki mai kēia ʻano ʻino. ʻO ka emi ʻana o ka oxygen ma muli o ka nele o ke kahe ʻana, no laila ʻaʻole hiki ke kaʻina hana passive. Hoʻopili ʻia ke koena pH o ka aperture a hoʻoulu i kahi kaulike ma waena o kēia wahi a me ka ʻili o waho. ʻO ka ʻoiaʻiʻo, ke kumu kēia i ka nui o ka corrosion a hiki ke hoʻonui ʻia e nā haʻahaʻa haʻahaʻa. ʻO ka hoʻohana ʻana i ka hoʻolālā hui kūpono e hōʻemi i ka pōʻino o ka pohā ʻana kekahi ala e pale ai i kēia ʻano ʻino.

ʻElectrochemical Corrosion
Inā hoʻokomo ʻia i loko o kahi hoʻonā corrosive a conductive paha, ʻelua mau metala ʻokoʻa electrochemical e hui pū ʻia, e hana i kahi kahe o nā electron ma waena o lākou. No ka mea, ʻo ka metala me ka liʻiliʻi liʻiliʻi ʻo ia ka anode, ʻoi aku ka hopena o ka metala me ka liʻiliʻi o ka corrosion. Ua kapa ʻia kēia ʻano ʻino he galvanic corrosion a i ʻole bimetallic corrosion.