This type of corrosion is caused by dissimilar metals within close proximity to each other in a wet fire sprinkler system. The water chemistry can affect this type of corrosion and should be considered in the design phase of any fire sprinkler system. The galvanic chart shows the corrosive nature of metals.
Those metals at the top of the chart will corrode before those at the bottom. Therefore iron pipe will corrode before brass or copper. The dissolved iron will react with minerals in the water and precipitate as deposits on piping, values, etc. These deposits can now cause under-deposit corrosion.Contact us