The galvanized bolts in the picture to the right were used to attach an outboard motor mounting bracket to a wooden boat. Over time, the motor's vibrations wore through the galvanized coating and allowed the steel below to corrode. In this application, high strength stainless steel would have been the best choice. Galvanized deck screws are popular for use in outdoor environments. However, if the surface of the galvanized coating is broken during installation rust will form and discolor the screw's head.
Galvanized coatings are ideal when price is a concern.
In marine applications and severe environment other materials such as stainless steel or silicone bronze might be a better choice. All rights reserved.