The conditions and mechanisms of copper pipe rusting：
1.The chemical basis of rusting.
The chemical reaction of copper rusting is 2Cu+H2O+CO2+O2→Cu2(OH)2CO3. This reaction requires the simultaneous satisfaction of three conditions: oxygen, water and carbon dioxide. The resulting patina (basic copper carbonate) is the main component of copper rust.
2.environment impact factors
Water quality characteristics : Acidic water (low pH) or high salt water (such as seawater) can accelerate the corrosion of copper tubes, causing copper ions to dissolve and resulting in blue-green water.
Medium type : Contact with liquids containing acids, bases, salts, or pollutants such as sulfides and nitrogen oxides in the air will destroy the stability of the oxide film on the copper surface. Physical state : Too low water flow rate causes pitting corrosion; too high water flow rate causes crushing corrosion.
The actual performance of corrosion resistance of copper tubes
Performance under normal conditions .
Copper tubes can remain stable for a long time in dry and clean environments, with a service life of several decades. The oxide film (copper rust layer) on their surface can effectively prevent further oxidation
Limitations in Special circumstances .
In high salt spray environments in coastal areas, hot water pipes (where water temperature accelerates chemical reactions), or untreated surface water/groundwater environments, the corrosion rate of copper pipes significantly increases, and obvious corrosion may occur after 5 to 7 years of use.