Heat exchange tubes resistant to seawater corrosion?
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I’ve heard that titanium tubes, copper alloy tubes, and aluminum alloy tubes can all be used as heat exchange tubes in seawater heat exchangers. I wonder which grade of aluminum alloy tube has good corrosion resistance in 70-degree seawater? Thank you!
What is the reason to necessarily use aluminum alloy heat exchangers? In fact, graphite heat exchangers have better resistance to seawater corrosion compared to aluminum alloy and titanium heat exchangers; their heat transfer coefficients are also higher than those of titanium, and the cost of such equipment is relatively lower.
Carbon steel can resist seawater corrosion after being aluminized or aluminized
What is the graphite heat transfer coefficient of domestically produced graphite heat exchangers at present?
There are quite a few optional materials available; it mainly depends on the temperature – different temperatures require different materials, and the prices of these materials also vary
To be honest, titanium is the best choice, but it’s more expensive. As mentioned above, coating it or using carbon steel on the outside with a layer inside could be an option, which would reduce the cost.
New steel grades resistant to hydrogen sulfide and high-temperature sulfur, as well as resistant to seawater corrosion: 07CrCuA1MoTi seamless steel, and 08Cr2AlMo seamless steel for use against stress corrosion caused by hydrogen sulfide and hydrogen chloride
Silicon carbide heat exchangers can be considered, as they offer excellent heat transfer performance.
Outer layer is galvanized, or the material is naval copper
Using polyaniline nanocoatings for corrosion protection is no problem, but the heat transfer efficiency will decrease; in such cases, additional heat exchangers can be used.