Ka uhi ʻana o Chromate no ka ʻili alumini

Ka uhi ʻana o Chromate

Hoʻopili ʻia nā alumini alumini a me nā alumini e kahi hoʻololi hoʻololi kū i ka corrosion i kapa ʻia ʻo "chromate coating" a i ʻole "chromating". General ʻO ka hoʻomaʻemaʻe ʻana i ka ʻili aluminika a laila hoʻopili i kahi haku chromium acidic ma kēlā ʻili maʻemaʻe. ʻO nā pale hoʻololi Chromium he kūpaʻa ʻino loa a hāʻawi i ka paʻa maikaʻi o nā uhi hope. Hiki ke hoʻohana ʻia nā ʻano ʻano ʻokoʻa like ʻole i ka uhi hoʻololi chromate e hana i kahi ʻili kūpono.

ʻO ka mea a mākou i kapa ai he phosphating i ke kila i ka hao i kapa ʻia ʻo chromating no nā papa alumini. Ua ʻike ʻia ʻo ia he alodine coating. Aia nā ʻano chromating melemele, ʻōmaʻomaʻo a aniani. Nā lole chromate melemele Cr+6, nā lole chromate ʻōmaʻomaʻo Cr+3. Hiki ke hoʻololi ke kaumaha o ka uhi e like me ka manawa noi a me ke ʻano o ka uhi. ʻAʻole pono e hala ka mahana maloʻo ma luna o 65 º C no ka chromate melemele a me 85 º C no nā uhi chromate ʻōmaʻomaʻo a aniani.

He mea nui ia e hoʻolako i ka ʻili maʻemaʻe a me ka momona ʻole ma mua o ka hoʻohana ʻana i ka chromate. Inā hoʻomākaukau ʻia ka ʻauʻau ʻauʻau wela, hiki ke hoʻohana ʻia ka ʻauʻau caustic a me ka ʻauʻau wai nitric no ka pickling. Ma ka ʻaoʻao ʻē aʻe, loaʻa i nā ʻauʻau ʻauʻau acidic degreasing ka mana pickling me ia iho. ʻOi aku ka maikaʻi o ka Chromating a me ka hoʻopili paʻi ʻana ma luna o ka ʻili alumini i hoʻomaʻemaʻe ʻia.

Me ka hāʻawi ʻana i ke kūpaʻa corrosion kiʻekiʻe a me nā waiwai adhesion pena i ka ʻili alumini, ua ʻike ʻia e hiki ke hoʻomaikaʻi ʻia ka makemake ʻike ma ka hana ʻana i kahi uhi chromate ma ka hoʻopili ʻana i ka ʻili me kahi hopena hoʻololi hoʻololi wai i loaʻa nā ion chromium a me nā mea hoʻohui ʻē aʻe.

Ua pani ʻia nā manaʻo