How long does it take for corrosion to occur?
There are a lot of variables that can affect the corrosion rates of metal, such as environmental conditions (temperature and rain/moisture), concentration of the chemical preservative in the wood, moisture content of the wood, exposure of the deck, type of connectors/fasteners used, etc. Under continuously wet laboratory conditions, corrosion of galvanized metal connectors in contact with ACQ, CA-B, and ACZA-treated wood can become visible in a very short period of time weeks or months rather than years. Depending on the corrosiveness of the environment, this period may vary. Since corrosion begins from the inside of the joist hanger (at the point of contact with the wood), it is difficult to notice until it becomes quite advanced.
