Yuav ua li cas kom raug nrog cov teeb meem blackening ntawm flange fais cua raj

{{01. npaj ua ntej tu: ua ntej ntxuav cov raj ntawm lub raj hluav taws xob cua sov huv thiab huv si.

2. Kev kho cov raj ntsuas hluav taws xob kom ntseeg tau tias yog cov khoom huv si los ntawm kev ua kom huv si

{{0 {}} pickling: tom qab degrite thiab alkaline cov raj, thiab lub raj raj kub tom qab kho, ntxuav cov dej hluav taws xob ua kom huv si,}.

{{04. Blackening Kev Kho Mob: Xyuas kom lub sijhawm siv tau yog li 10 feeb} Tom qab kev kho mob {}}

{5.}} Ua tiav ziab thiab ua kom lub zog hluav taws xob ua kom zoo nkauj, thiab tom qab siv hluav taws xob cua sov hauv kev tiv thaiv corrosion {}}