1. Muaj plaub txoj kev polishing ntawm ob theemhlau flange: phau ntawv, mechanical, chemical thiab electrochemical. Lub corrosion kuj thiab kho kom zoo nkauj ntawm lubflangetuaj yeem txhim kho los ntawm polishing. Cov hluav taws xob polishing kua uas twb muaj lawm ntawm stainless hlau tseem siv phosphoric acid thiab chromic anhydride. Hauv cov txheej txheem ntawm polishing thiab tu, qee cov chromium thiab phosphorus yuav raug tso tawm rau hauv cov dej khib nyiab, ua rau muaj kuab paug rau ib puag ncig.

2. Passivation zaj duab xis yuav raug tsim nyob rau saum npoo ntawm duplexhlau flange, thiab oxide zaj duab xis yuav pib yaj. Vim hais tias qhov saum npoo microstructure ntawm duplexhlau flangetsis zoo ib yam, qhov me ntsis convex ib feem ntawm qhov chaw yog nyiam dua yaj, thiab tus nqi dissolution yuav siab dua li ntawm qhov concave. Kev tawg thiab tsim ntawm daim nyias nyias yog yuav luag tib lub sijhawm, tab sis lawv qhov nrawm sib txawv. Yog li ntawd, qhov roughness ntawm ob-theem steel flange raug txo, uas ua rau lub ntsej muag du, ci ntsa iab.
3. Qee qhov tsis xws luag xws li nto pores thiab khawb tuaj yeem ua tiav los ntawm polishing, txhawm rau txhim kho kev qaug zog thiab cuam tshuam corrosion. Biphase steel flanges muaj ntau tshaj li ob zaug lub zog tawm los ntawm austenitic stainless hlau, thiab muaj cov yas txaus thiab toughness xav tau rau qhov molding no, nrog rau kev ntxhov siab zoo dua corrosion, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig chloride.