1. Simbi isina ngura haina ngura, inoburitsawo oxide pamusoro.

Iyo nzira isina ngura yesimbi dzese dzisina tsvina pari zvino pamusika nekuda kwekuvapo kweCr.Chikonzero chakakosha chekupokana nekuora kwesimbi isina tsvina ndiyo passive film theory.Iyo inonzi passivation firimu ifirimu rakatetepa rinonyanya kuumbwa neCr2O3 pamusoro pesimbi isina tsvina.Nekuda kwekuvapo kweiyi firimu, kuodzwa kwesimbi isina simbi substrate mune dzakasiyana midhiya kunodzivirirwa, uye chiitiko ichi chinonzi passivation.

Pane mamiriro maviri ekuumbwa kwemhando iyi yefirimu yepassivation.Imwe ndeyekuti simbi isina tsvina pachayo ine kugona kwekuzvida.Iyi yekuzvimisa-passivation kugona kunowedzera nekuwedzera kweiyo chromium yemukati, saka ine ngura kuramba;imwe Mamiriro ekugadzirisa akawedzera ndeyekuti simbi isina tsvina inoumba firimu rekuita mukati mekuita corroded mumhando dzakasiyana-siyana dzemvura (electrolytes) kudzivirira kuparara.Kana iyo passivation firimu yakuvadzwa, nyowani passivation firimu inogona kuumbwa nekukurumidza.

Iyo Stainless simbi passivation firimu inokwanisa kurwisa ngura, kune matatu maitiro: kutanga, ukobvu hwepassivation firimu hwakaonda zvakanyanya, kazhinji mamicrons mashoma pasi peiyo chromium content> 10.5%;yechipiri ndiyo chaiyo giravhiti yefirimu yekupfuura Iyo yakakura kupfuura iyo chaiyo giravhiti ye substrate;maitiro maviri aya anoratidza kuti iyo passivation firimu yakaonda uye yakaonda, saka, iyo passivation firimu inonetsa kupinzwa neyakaora svikiro kuti ikurumidze kukanganisa substrate;chikamu chechitatu ndeye chromium concentration ratio ye passivation film Iyo substrate inopfuura katatu yakakwirira;saka, iyo passivation firimu ine yakakwira corrosion resistance.

2. Simbi isina tsvina ichasvibiswawo pasi pemamwe mamiriro ezvinhu.

Mamiriro ekushandisa esimbi isina tsvina akanyanya kuomarara, uye iyo yakachena chromium oxide passivation firimu haigone kuzadzisa zvinodikanwa zvekupokana kwakanyanya.Nokudaro, zvakakosha kuwedzera zvinhu zvakadai se molybdenum (Mo), mhangura (Cu), nitrogen (N), nezvimwewo kune simbi maererano nemamiriro akasiyana-siyana ekushandisa kuti uvandudze kuumbwa kwefirimu yepasi uye kuwedzera kuwedzera kusimba kwekuora. simbi isina ngura.Kuwedzera Mo, nekuti iyo corrosion product MoO2- iri pedyo ne substrate, inokurudzira zvakasimba kusanganisa passivation uye inodzivirira kuparara kwe substrate;kuwedzererwa kweCu kunoita kuti iyo passive firimu pamusoro pesimbi isina tsvina ine CuCl, iyo inovandudzwa nekuti haina kupindirana neyakaora svikiro.Corrosion resistance;kuwedzera N, nekuti iyo passivation firimu yakafumiswa neCr2N, iyo concentration yeCr mune passivation firimu inowedzerwa, nekudaro ichivandudza kushora kwesimbi yesimbi isina tsvina.

Iyo corrosion resistance yesimbi isina tsvina inoenderana.Mucherechedzo wesimbi isina simbi inoshingirira mukuora mune imwe svikiro, asi inogona kukuvara mune imwe svikiro.Panguva imwecheteyo, kupikisa kwekuora kwesimbi isina tsvina kunewo hukama.Kusvika pari zvino, hapana simbi isina tsvina iyo isingaparadzi zvachose munzvimbo dzese.

3. Sensitization chiitiko.

Simbi isina tsvina ine Cr uye inoumba chromium oxide firimu pamusoro, iyo inorasikirwa nemakemikari kuita uye inonzi passivated state.Nekudaro, kana iyo austenitic system ikapfuura nepakati tembiricha ye475 ~ 850 ℃, C ichasangana neCr kugadzira chromium carbide (Cr23C6) uye inonaya mukristaro.Naizvozvo, iyo Cr yemukati padyo nemuganhu wezviyo inoderedzwa zvakanyanya, ichiva Cr-varombo dunhu.Panguva ino, kushorwa kwayo kunenge kwakadzikira, uye kunonyanya kunzwisiswa nemamiriro ekuora, saka inonzi sensitization.Sensitization inowanzoita corrode munzvimbo yekushandisa yeoxidizing acid.Mukuwedzera, kune welding inopisa-yakakanganiswa nzvimbo uye inopisa bending processing zones.

4. Saka simbi isina tsvina ichaora mumamiriro api?

Kutaura zvazviri, simbi isina tsvina haifaniri kunge isina ngura, asi chiyero chayo chekuora chakaderera kudarika mamwe masimbi pasi pemamiriro akafanana, uye dzimwe nguva inogona kuregererwa.