Relationship of Corrosion Rates to Water Chemistry in the Freeport Test Bed Plant,

摘要

The corrosion rates in this report are actual corrosion rates and not just relative values. Average corrosion rates based on coupon weight loss are in close agreement with instantaneous corrosion rates obtained by instrument. The oft-times catastrophic corrosion rates obtained in an operating plant when Dissolved Oxygen (DO), CO2and pH are not properly controlled are discussed along with the detrimental effect of H2S on materials behavior. High DO is the most detrimental environmental factor in the corrosion of copper and steel. Instantaneous corrosion rate monitoring instrumentation is an excellent means of detecting air in leakage and resultant high corrosion of steel or copper alloys. Shutdowns and startups should be minimized with a fresh water wash and drain following shutdown. Corrosion rates during cyclic plant chlorination were high.