Wet corrosion of CuNiFer pipe in seawater

Thread starter Ters
Start date Feb 15, 2024
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Corrosion Material

Feb 15, 2024

Ters

TL;DR Summary: Wet corrosion CuNiFer pipes?

This CuNiFer alloy pipe is used in a seawater cooling system and is electrical insulted with nearby metals; this prevents galvanic corrosion to occur since there is no contact with other metals. I've seen multiple sources that say CuNiFer is very corrosion resistance.

The pipe is still protected with a zinc sacrificial anode (red painted bolt). I've found some about wet corrosion in CuNiFer pipes but i'm not sure if this is true. What is the purpose of this protection, against what kind of corrosion is this and what is the driving force of this corrosion? Can you give me the corresponding source?

The paper about CuNiFer wet corrosion: https://www.google.com/url?sa=t&rct...usg=AOvVaw1layEHHCPnsWGdlSPHU-gF&opi=89978449

Last edited by a moderator: Feb 15, 2024

FAQ: Wet corrosion of CuNiFer pipe in seawater

What is wet corrosion in the context of CuNiFer pipes in seawater?

Wet corrosion refers to the electrochemical process that occurs when metal surfaces are exposed to a liquid environment, such as seawater. In the case of CuNiFer pipes, which are copper-nickel alloys, wet corrosion can lead to the deterioration of the metal due to the interaction with chloride ions and other corrosive elements present in seawater.

What are the main factors that influence the corrosion of CuNiFer pipes in seawater?

The main factors influencing the corrosion of CuNiFer pipes in seawater include the salinity and temperature of the water, the presence of oxygen, the flow rate of the seawater, and the concentration of corrosive ions such as chlorides and sulfides. Additionally, biological factors, such as the presence of marine organisms, can also affect corrosion rates.

How does the composition of CuNiFer alloys affect their corrosion resistance?

The composition of CuNiFer alloys, typically containing copper, nickel, and iron, plays a crucial role in their corrosion resistance. The presence of nickel enhances the alloy's ability to form a protective oxide layer, which can significantly reduce corrosion rates. The specific ratios of these metals can be tailored to optimize performance in seawater environments.

What are the common methods to mitigate wet corrosion in CuNiFer pipes?

Common methods to mitigate wet corrosion in CuNiFer pipes include applying protective coatings, using cathodic protection systems, maintaining proper water chemistry, and implementing regular inspection and maintenance routines. Additionally, using corrosion inhibitors can help reduce the rate of corrosion in seawater environments.

What are the signs of corrosion in CuNiFer pipes, and how can they be detected?

Signs of corrosion in CuNiFer pipes may include pitting, discoloration, surface roughness, and leaks. Detection methods can include visual inspections, ultrasonic thickness measurements, and electrochemical techniques. Regular monitoring is essential to identify corrosion early and prevent significant damage.