ʻO ka ʻokoʻa ma waena o ka phosphating a me ka passivation treatments i nā metala aia i kā lākou kumu a me nā hana.

He ala koʻikoʻi ka Phosphating no ka pale ʻana i ka corrosion i nā mea metala.ʻO kāna mau pahuhopu ka hāʻawi ʻana i ka pale corrosion i ka metala kumu, lawelawe ma ke ʻano he kumu mua ma mua o ka pena ʻana, hoʻonui i ka hoʻopili ʻana a me ka pale ʻana i ka corrosion o nā papa uhi, a me ke ʻano he lubricant i ka hana metala.Hiki ke hoʻokaʻawale ʻia ka Phosphating i ʻekolu ʻano ma muli o kāna mau noi: 1) uhi phosphating, 2) anu extrusion lubrication phosphating, a me 3) decorative phosphating.Hiki ke hoʻokaʻawale ʻia e ke ʻano o ka phosphate i hoʻohana ʻia, e like me ka zinc phosphate, zinc-calcium phosphate, iron phosphate, zinc-manganese phosphate, a me manganese phosphate.Hoʻohui ʻia, hiki ke hoʻokaʻawale ʻia ka phosphating e ka mahana: ka wela kiʻekiʻe (ma luna o 80 ℃) phosphating, ka wela waena (50-70 ℃) phosphating, ka wela haʻahaʻa (ma kahi o 40 ℃) phosphating, a me ka wela o ka lumi (10-30 ℃) phosphating.

Ma kekahi ʻaoʻao, pehea ka hopena o ka passivation i nā metala, a he aha kāna hana?He mea nui e hoʻomaopopo i ka passivation kahi mea i hoʻokumu ʻia e ka pilina ma waena o ka pae metala a me ka pae hoʻonā a i ʻole e nā hanana interfacial.Ua hōʻike ʻia ka noiʻi i ka hopena o ka abrasion mechanical ma nā metala ma kahi kūlana passivated.Hōʻike nā hoʻokolohua ʻo ka hoʻomau mau ʻana o ka ʻili metala ke kumu o ka hoʻololi maikaʻi ʻole i ka hiki ke metala, e hoʻāla ana i ka metala ma kahi kūlana passivated.Hōʻike kēia i ka passivation kahi hanana interfacial e kū nei i ka wā e hoʻopili ai nā metala me kahi mea ma lalo o kekahi mau kūlana.Hoʻomaka ka passivation electrochemical i ka wā o ka anodic polarization, e alakaʻi ana i nā loli i ka hiki o ka metala a me ka hoʻokumu ʻana o nā ʻokikene metala a i ʻole nā ​​paʻakai ma ka ʻili electrode, e hana ana i kahi kiʻiʻoniʻoni passive a hoʻoulu i ka passivation metala.ʻO ka passivation kemika, ma ka ʻaoʻao ʻē aʻe, pili i ka hana pololei o nā mea hoʻoheheʻe e like me ka HNO3 i hoʻopaʻa ʻia ma ka metala, e hana ana i kahi kiʻiʻoniʻoni oxide ma ka ʻili, a i ʻole ka hoʻohui ʻana o nā metala maʻalahi e like me Cr a me Ni.I ka passivation kemika, ʻaʻole pono e hāʻule ka manaʻo o ka mea hoʻoheheʻe i hoʻohui ʻia ma lalo o kahi waiwai koʻikoʻi;a i ʻole, ʻaʻole ia e hoʻoulu i ka passivation a hiki ke alakaʻi i ka hoʻoheheʻe metala wikiwiki.