Formation of a protective coating to improve the corrosion resistance of copper alloy heat exchangers.

To improve corrosion resistance! We will confirm that an appropriate initial iron skin film has been formed.

The inner surface of the small tubes of copper alloy heat exchangers using seawater as cooling water needs to have a protective film formed to improve corrosion resistance. Generally, a method is adopted where iron ions are injected into the cooling water to form a protective film of iron hydroxide on the surface of the small tubes. However, excessive injection of iron ions can lead to a decrease in thermal efficiency, while insufficient injection of iron ions cannot achieve adequate corrosion resistance. Therefore, our company conducts monitoring surveys to confirm that an appropriate initial iron film has been formed. [Method] - A bypass line is installed on the piping at the outlet side of the condenser of the circulating water pipe, and a sample tube is attached. - Seawater is passed through the bypass line simultaneously with the startup of the circulating water pump. - Regular measurements of polarization resistance and visual observations are conducted to assess the status of iron film formation. *For more details, please refer to the PDF document or feel free to contact us.

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