What is it about?
Alloy 690 is used for nuclear steam generator alloy tubing. This material is used in a heat-treated condition. Although, alloy 690 is hard to sensitize due to its high chromium content determining the extent of chromium depletion at grain boundaries is key to ensure the proper resistance of tubes to the different stress corrosion cracking (SCC) submodes that may occur. This paper establishes the appropriate conditions to determine the degree of sensitization of alloy 690 by the double loop electrochemical potentiokinetic reactivation test.
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Why is it important?
The optimized method can be used to determine the degree of sensitization of alloy 690 with confidence.
Perspectives
The optimized method may be used to correlated the degree of sensitization of alloy 690 with its resistance to the different SCC submodes in different metallurgical conditions.
Dr Martín A Rodríguez
Comision Nacional de Energia Atomica
Read the Original
This page is a summary of: Optimization of the Double Loop Electrochemical Potentiokinetic Reactivation Method for Detecting Sensitization of Nickel Alloy 690, CORROSION, February 2018, NACE International,
DOI: 10.5006/2562.
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