1. Karfe ba ya tsatsa, yana kuma haifar da oxide a saman.

Tsarin da ba shi da tsatsa na duk bakin karfe a halin yanzu a kasuwa shine saboda kasancewar Cr.Babban dalili na juriya na lalata na bakin karfe shine ka'idar fim mai wucewa.Fim ɗin da ake kira passivation fim ne na bakin ciki wanda ya ƙunshi Cr2O3 akan saman bakin karfe.Saboda wanzuwar wannan fim, lalatawar bakin karfe a cikin kafofin watsa labarai daban-daban yana fuskantar cikas, kuma ana kiran wannan lamarin passivation.

Akwai yanayi guda biyu don samar da irin wannan fim ɗin wucewa.Na daya shi ne bakin karfe da kansa yana da ikon wuce gona da iri.Wannan ikon wucewar kai yana ƙaruwa tare da haɓaka abun ciki na chromium, don haka yana da juriya na tsatsa;da sauran A mafi m samuwar yanayin shi ne bakin karfe samar da m fim a kan aiwatar da ake lalata a cikin daban-daban na ruwa mafita (electrolytes) don hana lalata.Lokacin da fim ɗin wucewa ya lalace, ana iya ƙirƙirar sabon fim ɗin wucewa nan da nan.

Fim ɗin wucewar bakin karfe yana da ikon tsayayya da lalata, akwai halaye guda uku: na farko, kauri na fim ɗin wucewa yana da bakin ciki sosai, gabaɗaya kawai 'yan microns a ƙarƙashin yanayin abun ciki na chromium> 10.5%;na biyu shi ne ƙayyadaddun nauyi na fim ɗin wucewa Ya fi girma na musamman na substrate;waɗannan halaye guda biyu suna nuna cewa fim ɗin wucewa yana da bakin ciki kuma mai yawa, don haka, fim ɗin wucewa yana da wahala a shigar da shi ta hanyar latsawa don saurin lalata substrate;Siffa ta uku ita ce rabon tattarawar chromium na fim ɗin wucewa The substrate ya fi sau uku mafi girma;sabili da haka, fim ɗin wucewa yana da juriya na lalata.

2. Bakin karfe kuma zai lalace a wasu sharudda.

Yanayin aikace-aikacen na bakin karfe yana da matukar rikitarwa, kuma fim din chromium oxide passivation mai tsabta ba zai iya biyan bukatun babban juriya na lalata ba.Saboda haka, wajibi ne don ƙara abubuwa kamar molybdenum (Mo), jan karfe (Cu), nitrogen (N), da dai sauransu zuwa karfe bisa ga yanayin amfani daban-daban don inganta abun da ke ciki na fim din wucewa da kuma kara inganta juriya na lalata. bakin karfe.Ƙara Mo, saboda samfurin lalata MoO2- yana kusa da substrate, yana ƙarfafa ƙarfin haɗin gwiwa kuma yana hana lalata na substrate;Bugu da ƙari na Cu yana sanya fim ɗin da ba a so a saman bakin karfe ya ƙunshi CuCl, wanda aka inganta saboda baya hulɗa tare da matsakaicin lalata.Juriya na lalata;ƙara N, saboda fim ɗin wucewa yana wadatar da Cr2N, ƙaddamarwar Cr a cikin fim ɗin wucewa ya karu, ta haka yana haɓaka juriya na lalata bakin karfe.

Juriya na lalata bakin karfe yana da sharadi.Alamar bakin karfe tana da juriya da lalata a wani matsakaici, amma yana iya lalacewa a wata matsakaici.A lokaci guda, juriya na lalata na bakin karfe shima dangi ne.Ya zuwa yanzu, babu bakin karfen da ba shi da lalacewa a kowane yanayi.

3. Al'amari na hankali.

Bakin karfe ya ƙunshi Cr kuma ya samar da fim ɗin chromium oxide a saman, wanda ke rasa ayyukan sinadarai kuma ana kiransa yanayin wucewa.Duk da haka, idan tsarin austenitic ya wuce ta cikin kewayon zafin jiki na 475 ~ 850 ℃, C zai haɗu tare da Cr don samar da chromium carbide (Cr23C6) da haɓaka a cikin crystal.Saboda haka, abun ciki na Cr kusa da iyakar hatsi ya ragu sosai, ya zama yankin Cr-talakawa.A wannan lokacin, juriya ta lalata za ta ragu, kuma tana da kulawa ta musamman ga mahalli masu lalata, don haka ana kiransa hankali.Hankali yana iya lalacewa a yanayin amfani da acid oxidizing.Bugu da kari, akwai yankunan walda da zafi ya shafa da kuma wuraren sarrafa zafi.

4. To a wane yanayi bakin karfe zai lalace?

Hasali ma, bakin karfe ba lallai ne ya zama mai tsatsa ba, amma yawan lalatarsa ​​ya yi kasa sosai fiye da sauran karafa da ke karkashin muhalli guda, wani lokacin kuma ana iya yin watsi da shi.