Besides the coating, we could also improve the material’s anti-corrosion property by using a marine grade steel, such as ASTM A690.
The main difference between A690 and traditional steel is that A690 requires at least 0.50% copper, which has increased the anti-corrosion property of the material.
The main concern for people using the cold-formed sheet pile is its waterproof function at the interlock.
However, whatever it is cold-formed sheet pile or hot-rolled sheet pile, both of them could not be 100% waterproof. So it is quite necessary to use the sealant at the interlock if the project has a very high waterproof requirement.