Protection of Propeller Shaft
This propeller shaft was exposed to severe bi-metallic corrosion. By applying Wencon epoxy products, you are able to protect your ship equipment against future corrosion and avoid replacing it for newer parts. It is cost friendly and good for the green maritime agenda.
Protection against bi-metallic corrosion
on propeller shaft
Location
Istanbul, TR – DESAN SHIPYARD
Job and report done by
Esko Marine and BTMteknik
Wencon products used
Coating White, Coating Blue, Cleaner, appl.
tools
A common problem among propeller shafts
Bi-metallic corrosion, also known as galvanic corrosion, occurs when two different metals are in electrical contact with each other in the presence of an electrolyte, such as seawater. This reaction often leads to accelerated corrosion of the less noble metal, resulting in significant damage to propeller shafts over time. This type of corrosion is particularly concerning in the marine environment, where the combination of saltwater, varying temperatures, and constant exposure to harsh elements makes propeller shafts vulnerable. Therefore, it was crucial to act upon the damage and rebuild and protect the propeller shaft against future corrosion.
The Wencon application process
Sandblasting and cleaning of the surface
Before applying Wencon epoxy to the propeller shaft, it is essential to prepare the surface properly to ensure optimal adhesion. This was done by sandblasting the surface and afterwards clean the surface twice using Wencon Cleaner.
The 1st layer of Wencon Coating White
After cleaning two times with Wencon Cleaner, first layer of Wencon Coating White was applied very thin, and massaged into the surface and profile to make an excellent adhesion. The layer
was applied without rotating the shaft.
2nd layer of Wencon Coating White applied
After semi curing (aprox. 2 hours) Second layer was applied with a brush while the lathe was turning with 9 rpm.
3rd layer of Wencon Coating Blue applied – and done!
After semi curing (aprox. 2 hours) the third layer was applied with Wencon
Coating Blue. During application of the second and third layer, the thickness was controlled several times, using a wet film gauge. A heating gun was used to
secure that no air was entrapped in the coating. The lathe was left rotating overnight. Final result.
Propeller shaft can now withstand future challenges
After applying Wencon White and Blue coatings to the propeller shaft, the shaft is now shielded from future corrosion. This robust, dual-layer epoxy provides a resilient barrier against the harsh marine environment, ensuring the propeller shaft’s lifespan and reducing the need for frequent maintenance. With Wencon’s protective epoxy coating, the propeller shaft is well-equipped to withstand the challenges of bi-metallic corrosion, ensuring reliable performance for years to come.
