Why Does Stainless Steel "Rust"?
I thought it weird. My knives rusted in the USA but they don't rust down here -- even in a salt air environment. It ain't the chili... Turns out the culprit is Chlorine. Even as little chlori...
Forum Discussion
Stainless steel potted in epoxy, will corrode as it is deprived from oxygen. I have removable surfboard fins whose tabs require reinforcement, and I used to predrill from the base up into the base of the fin, and used #6 sheet metal screws to bridge the high stress area.
Almost every fin I did this to has shown some corrosion, and I now make carbon fiber rods out of roving and epoxy and use these in place of the SS screws. The stainless steel also proved to not be up to the task of the stresses placed on it. The fin did not break off, the stainless steel screws bent but allowed me to not lose the fin.
This is some pretty heavy usage for Stainless as the salt water will remain in the fin receptacle long after the surf session is over, and when it does dry out the concentrated salt will weep from the fin receptacles.
I do not know the grade of stainless used on these fasteners, but it is not magnetic at all.
It is also possible for the stainless steel heads to be impregnated with steel from the screwdriver head, and they will bleed rust stains.
I have some cheap stainsteel chef's knives which will show rust spotting and which proves resistant to removal. These knives do not hold an edge very long either, and if i quickly sharpen them using the same stone that i used on my carbon steel machete, it might develop micro rust stains on the bevelled edge, which actually seems to help cut through a ripe tomato even better.
Almost every fin I did this to has shown some corrosion, and I now make carbon fiber rods out of roving and epoxy and use these in place of the SS screws. The stainless steel also proved to not be up to the task of the stresses placed on it. The fin did not break off, the stainless steel screws bent but allowed me to not lose the fin.
This is some pretty heavy usage for Stainless as the salt water will remain in the fin receptacle long after the surf session is over, and when it does dry out the concentrated salt will weep from the fin receptacles.
I do not know the grade of stainless used on these fasteners, but it is not magnetic at all.
It is also possible for the stainless steel heads to be impregnated with steel from the screwdriver head, and they will bleed rust stains.
I have some cheap stainsteel chef's knives which will show rust spotting and which proves resistant to removal. These knives do not hold an edge very long either, and if i quickly sharpen them using the same stone that i used on my carbon steel machete, it might develop micro rust stains on the bevelled edge, which actually seems to help cut through a ripe tomato even better.
