Kunezindlela zemishini, amakhemikhali, kanye ne-electrochemical ukususa isikali se-oxide samapayipi ensimbi engagqwali.

Ngenxa yenkimbinkimbi yokwakheka kwesilinganiso se-oxide yamapayipi ensimbi engagqwali ahlanzekile, akulula ukususa isikali se-oxide ebusweni, kodwa futhi ukwenza ubuso bube phezulu bufinyelele izinga eliphezulu lokuhlanzeka nokushelela.Ukususwa kwesikali se-oxide emapayipini ensimbi engenasici ngokuvamile kuthatha izinyathelo ezimbili, esisodwa esokwelashwa kusengaphambili, futhi isinyathelo sesibili ukususa umlotha ne-slag.

I-oxide scale scale pretreatment of sanitary stainless steel pipe yenza isikali se-oxide silahlekelwe, bese kuba lula ukususa ngokukhetha.Ukwelashwa ngaphambi kwesikhathi kungahlukaniswa ngezindlela ezilandelayo: indlela yokwelapha yokuncibilika kwe-alkaline nitrate.Ukuncibilika kwe-alkaline kuqukethe u-87% we-hydroxide kanye no-13% we-nitrate.Isilinganiso salokhu okubili kusawoti oncibilikisiwe kufanele kulawulwe ngokucophelela ukuze usawoti oncibilikisiwe ube namandla oksijidi aqine kakhulu, indawo yokuncibilika, kanye ne-viscosity encane.Enqubweni yokukhiqiza, okuqukethwe kwe-nitrate ye-sodium kuphela akukho ngaphansi kuka-8% (wt).Ukwelashwa kwenziwa esithandweni sokugeza usawoti, izinga lokushisa liyi-450 ~ 470℃, futhi isikhathi siyimizuzu emi-5 yensimbi engagqwali ye-ferritic nemizuzu engama-30 yensimbi engagqwali ye-austenitic.Ngokufanayo, ama-iron oxides nama-spinels angabuye afakwe i-nitrate futhi alahlekelwe yi-trivalent iron oxides, esuswa kalula ngokukhetha.Ngenxa yomphumela wokushisa okuphezulu, ama-oxide avelayo ahlutshiwe ngokwengxenye futhi acwiliswe kubhavu ngendlela ye-sludge.Phansi kwesithando somlilo.

Inqubo yokuncibilika kwe-alkaline nitrate: ukuncibilika komusi→ukushisa ngaphambili (150 ~ 250℃, isikhathi 20~30min)→ukwelashwa usawoti oncibilikisiwe→ukucisha amanzi→ukugeza amanzi ashisayo.Ukwelashwa kukasawoti okuncibilikisiwe akufanelekile emibuthanweni enezikhala ze-weld noma i-crimping.Lapho izingxenye zikhishwa esithandweni somlilo esincibilikisiwe sikasawoti futhi amanzi acinywa, kuzosaphazwa i-alkali nenkungu kasawoti ebabayo, ngakho-ke uhlobo lwe-don ejulile kufanele lwamukelwe ukuze kucinywe amanzi.Ithangi lokucisha amanzi elingangenwa amanzi.Lapho amanzi ecisha, qala ngokuphakamisela ubhasikidi wezingxenye ethangini, ume ngaphezu kwendawo evundlile, vala ikhava yethangi, bese wehlisela ubhasikidi wezingxenye emanzini aze acwile.

I-alkaline potassium permanganate pretreatment: ikhambi lokwelapha liqukethe i-sodium hydroxide 100→125g/L, sodium carbonate 100→125g/L, potassium permanganate 50g/L, izinga lokushisa isisombululo 95~105℃, isikhathi sokwelashwa 2 ~ 4 amahora.Nakuba ukwelashwa kwe-alkaline potassium permanganate akukuhle njengokwelashwa kukasawoti oncibilikisiwe, inzuzo yayo ukuthi ifaneleka emibuthanweni enezingqimba ezishiselwe noma i-crimping.

Ukuze uxegise isikali se-oxide, i-asidi eqinile elandelayo isetshenziswa ngokuqondile ukuze iphathwe kusengaphambili ngendlela yokucwilisa.

Ukuze uvimbele i-asidi ukuthi ingancibiliki isisekelo sensimbi, isikhathi sokucwiliswa kanye nezinga lokushisa le-asidi kufanele kulawulwe ngokucophelela.