{"id":9249,"date":"2025-08-21T14:57:08","date_gmt":"2025-08-21T06:57:08","guid":{"rendered":"http:\/\/www.zhengyuan-valve.com\/?p=9249"},"modified":"2025-08-21T14:57:08","modified_gmt":"2025-08-21T06:57:08","slug":"how-to-control-the-rusting-of-forged-steel-valves","status":"publish","type":"post","link":"http:\/\/www.zhengyuan-valve.com\/?p=9249","title":{"rendered":"How to control the rusting of forged steel valves?"},"content":{"rendered":"

The rust prevention measures for forged steel valves should start from three aspects: material selection, process treatment, and daily maintenance.
\nAt the material level:
\nPriority should be given to stainless steel materials with a chromium content higher than 12%. Chromium reacts with oxygen to form a dense chromium oxide passivation film, which can block the penetration of moisture and corrosive media. If carbon steel substrate is used, a zinc protective layer needs to be formed through galvanizing or hot-dip galvanizing process, sacrificing anode characteristics to delay substrate corrosion.
\nIn terms of processing technology:
\nAcid pickling passivation is the core process: first, remove the surface oxide scale and free iron with phosphoric acid or nitric acid solution, and then form a nanoscale oxide film through passivation solution (such as a solution containing chromium nitrate) to improve salt spray resistance for more than 220 hours.
\nKey parts (such as valve stem sealing surface):
\nIt can be coated with polytetrafluoroethylene, utilizing its low friction coefficient and chemical inertness for dual protection.
\nDuring the usage and maintenance phase:
\nRegular inspection of valve body welds and sealing surfaces is required. If rust is found, it should be immediately treated with a specialized cleaning agent (such as KM0109) and coated with anti rust oil.
\nIt is recommended to install electrochemical anode protection devices in humid environments to protect steel components by consuming zinc or magnesium blocks.
\nValves that have been out of service for a long time should be injected with anti rust grease and replaced with inert gas (such as nitrogen) to remove residual media in the pipeline.<\/p>\n

\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

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