유동가속부식에 영향을 미치는 수화학 인자 : pH, 용존산소, 하이드라진
Effect of Water Chemistry Factors on Flow Accelerated Corrosion : pH, DO, Hydrazine
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초록
Flow accelerated corrosion(FAC) of the carbon steel piping in pressurized water reactors(PWRs) has beenmajor issue in nuclear industry. Severe accident at Surry Unit 2 in 1986 initiated the worldwide interestin this area. Major parameters influencing FAC are material composition, microstructure, water chemistry,and hydrodynamics. Qualitative behaviors of FAC have been well understood but quantitative data aboutFAC have not been published for proprietary reason. In order to minimize the FAC in PWRs, the optimalmethod is to control water chemistry factors. Chemistry factors influencing FAC such as pH, corrosionpotential, and hydrazine contents were reviewed in this paper. FAC rate decreased with pH up to 10 becausemagnetite solubility decreased with pH. Corrosion potential is generally controlled dissolved oxygen (DO)and hydrazine in secondary water. DO increased corrosion potential. FAC rate decreased with DO by stabilizingmagnetite at low DO concentration or by formation of hematite at high DO concentration. Even thoughhydrazine is generally used to remove DO, hydrazine itself thermally decomposed to ammonia, nitrogen,and hydrogen raising pH. Hydrazine could react with iron and increased FAC rate. Effect of hydrazineon FAC is rather complex and should be careful in FAC analysis. FAC could be managed by adequatecombination of pH, corrosion potential, and hydrazine.
Abstract
Flow accelerated corrosion(FAC) of the carbon steel piping in pressurized water reactors(PWRs) has beenmajor issue in nuclear industry. Severe accident at Surry Unit 2 in 1986 initiated the worldwide interestin this area. Major parameters influencing FAC are material composition, microstructure, water chemistry,and hydrodynamics. Qualitative behaviors of FAC have been well understood but quantitative data aboutFAC have not been published for proprietary reason. In order to minimize the FAC in PWRs, the optimalmethod is to control water chemistry factors. Chemistry factors influencing FAC such as pH, corrosionpotential, and hydrazine contents were reviewed in this paper. FAC rate decreased with pH up to 10 becausemagnetite solubility decreased with pH. Corrosion potential is generally controlled dissolved oxygen (DO)and hydrazine in secondary water. DO increased corrosion potential. FAC rate decreased with DO by stabilizingmagnetite at low DO concentration or by formation of hematite at high DO concentration. Even thoughhydrazine is generally used to remove DO, hydrazine itself thermally decomposed to ammonia, nitrogen,and hydrogen raising pH. Hydrazine could react with iron and increased FAC rate. Effect of hydrazineon FAC is rather complex and should be careful in FAC analysis. FAC could be managed by adequatecombination of pH, corrosion potential, and hydrazine.
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