Ziziphi izizathu zentliziyo emnyama ye izitena ezikhanyelayo?

Intliziyo emnyama yinto eyenzekayo ngokulula kwimveliso yezitena eziphikisayo. Iimpawu zolu hlobo lwezitena zezi: umbala wendawo yezitena uguquka ngokuthe ngcembe, ukusuka kwi-yellow-green phezu komhlaba ukuya kwi-gray-black ngaphakathi. Ukuba olu hlobo lwezitena ezimnyama luphinde lufakwe kwi-oxidizing atmosphere, inxalenye emnyama engundoqo inokuphinda ifakwe kumhlophe.

Iioksidi zokungcola eziphambili kwizitena yi-iron oxide kunye ne-titanium oxide. Inokuthi ithathwe kwinto yokuba isitena esimnyama esimnyama siba mhlophe emva kokutshiswa kwakhona kwi-oxidizing atmosphere, kunokuchazwa ukuba umoya wokudubula kunye nokungcola kwee-oxide zentsimbi kunye ne-titanium ziimeko zesizukulwana se-cores emnyama. Nangona kunjalo, xa i-iron kunye ne-titanium oxides zihlala kunye okanye zikho zodwa, ziba nemiphumo eyahlukileyo enemibala yezitena ezikwaziyo. Xa i-titanium ion ikhona yodwa, umbala awubalulekanga, kwaye umzimba wezitena uluhlaza okwesibhakabhaka, ngelixa i-iron ion ikhona yodwa, umzimba wezitena unombala o-orenji-brown.

Oku ngasentla isizathu sokuba izitena eziphikisayo zivelise ama-black cores. Ukongeza, nakwindawo ene-oxidizing, umbala kunye nokuntywila kwe-alumina kunokonyusa ama-cores amnyama. Ngethuba lokuvelisa, kuyimfuneko ukulawula ukulungiswa kwezinto eziluhlaza, ukulawula ukushisa kunye nokushisa, ukunciphisa amathuba okuba neengxaki zentliziyo emnyama.