If the material of construction is steel, pin-hole corrosion is usually due to high chlorides in the water source. If the material of construction is a yellow metal alloy leachate can occur, the area around the pin-hole developes a characteristic spongy appearance.
Water treated with sulphide and a polymer based boiler treatment chemical were drwan into a desuperheater at a sugar mill. (The water used in the process is of condensate quality). Corrosion has been blamed on the break-down of sulphite to an acidic form. The pattern of corrosion however appears...
