hcallaway
Platinum Member
Did you use galvanized bolts? Going through the pressure treated 6x6 you can only use galvanized bolts due to the corrosive nature of the pressure treating. Your picture looks like you used just regular steel bolts. I hope I am wrong for your sake.
Rick
The bolts and other hardware are ZINC coated. Not the same level of protection, but in this application the only issue will be the head of the bolt my get surface rust.
They are not going to get direct exposure and once the treated wood drys out there will not be any more decay to amount to much. For the last 13 years prior to my new job selling Stainless Steel, I was a mill rep in the steel industry selling HDG sheet products (40-45K tons per year). Zinc is used in both processes. Hot Dipped Galvanized bolts are a thicker coating of Zinc and will give you better protection. A fence is a good example of an application of a HDG. Direct exposure. It will also rust. Plenty of air and being dry after getting wet will save the metal and the coating. ZINC gives itself up to the rust saving the base metal.