I suspect that there was an air gap between the bottom blade and the sole plate. It only takes a minute amount of moisture and air to start the corrosion process going then the result is plain as day.
When a bolt head is exposed to seaspray the corosion will cause a large build up of scale that to form on the nut increasing its size considerably - until you knock it off you then see the degree of wastage that has occurred.
When I was inspecting cranes, steel quayside ladders or bridge structures where corrosion is often found an allowance of 10% wastage was the guide for assessing the structural integrity of component parts.
Share This Page
This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.
The power of rust!
I suspect that there was an air gap between the bottom blade and the sole plate. It only takes a minute amount of moisture and air to start the corrosion process going then the result is plain as day.
When a bolt head is exposed to seaspray the corosion will cause a large build up of scale that to form on the nut increasing its size considerably - until you knock it off you then see the degree of wastage that has occurred.
When I was inspecting cranes, steel quayside ladders or bridge structures where corrosion is often found an allowance of 10% wastage was the guide for assessing the structural integrity of component parts.