Uea galvanized - ʻano kemika no ka wehe ʻana i ka uhi zinc

Uea hao haoi ka hoʻohana ʻana i kahi manawa, e ʻili ka ili o ka papa galvanized, e hāʻule, no laila e pili ana i ka nani o ka uea galvanized, e ʻae wale i ka ʻili o ka galvanized layer e wehe ʻia, ma hope o ka polishing, ka uhi hou ʻana, no laila. e like me ka hōʻoia ʻana i ka hoʻohana lōʻihi ʻana o ka uea galvanized.

ʻO ka mea mua, pono ka sodium hydroxide 200 ~ 300g / L sodium nitrite 100 ~ 200g / L wai e hoʻohui i ka 1L i hiki iā ʻoe ke wehe i nā ʻāpana koi a me ka uea metala a pēlā aku.ʻO 100 ℃ ka mahana mālama, a ʻo ka manawa a hiki i ka hoʻomaʻemaʻe.
ʻO ka pale o ka zinc coating ma ka hao matrix he ʻelua mau loina: ma ka ʻaoʻao hoʻokahi, ʻoiai ʻoi aku ka ikaika o ka zinc a maʻalahi hoʻi i ka oxidize ma mua o ka hao, akā ʻaʻole i ʻoluʻolu a paʻa kona kiʻi oxide e like me ka hao.ʻO ka papa oxide nui i hoʻokumu ʻia ma ka ʻili e kāohi i ka hoʻoneʻe hou ʻana o ka zinc i loko.ʻOi loa ma hope o ka passivation oi hooheheeiapapa, ʻoi aku ka mānoanoa a me ka paʻapū o ka ʻili o ka papa oxide, nona ka pale oxidation kiʻekiʻe.
Ma kekahiʻaoʻao, i ka wā o ka ili o kai hooheheeiaUa pōʻino ka papa, e hōʻike ana i ka matrix hao i loko, no ka mea, ʻoi aku ka ikaika o ka zinc ma mua o ka hao, i kēia manawa, ʻo ka zinc ke kuleana o ka mōhai ʻana i ka anode zinc, e hoʻoneʻe ʻia ka zinc ma mua o ka hao, i mea e pale ai i ka pae hao ʻaʻole e pōʻino.