| 摘要 |
A heat exchanger for use in a subsea environment comprises a vessel bound by a steel wall having an inner surface and an outer surface. In use the inner surface is in contact with a fluid wherein heat is transferred across the steel wall from the inner surface to the outer surface. The outer surface is in contact with sea water. The outer surface is coated with an aluminium coating layer and is provided with a sacrificial anode. The aluminum coating acts as a corrosion protector and the anode has an electrode potential slightly lower than the coating so that the difference in PH generated during oxidation at the anode is small and calcerous deposits are not generated on the aluminium coating. The alumiium coating may be applied by thermal spraying. The coating may be porous and sealed with a siloxane sealant. The heat exchanger may be an electrical component such as variable speed drive, transformer, capacitor, or switch gear requiring cooling and comprises an outer metallic surface with the aluminium coating and anode. |
