Materials Performance

JUN 2016

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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51 NACE INTERNATIONAL: VOL. 55, NO. 6 MATERIALS PERFORMANCE JUNE 2016 phologies and chemical elements of the f ra c tu re s w e re a n a ly z e d w ith a J S M - 6360L A † type scanning electron micro- scope (SEM) and the configurations were examined with an energy dispersive spec- trometer (EDS). In the ε-σ curve, the stress corrosion cracking (SCC) sensitivity index, I SCC , was defined as the ratio of characteristic pa- rameters in corrosive media and in air as shown in Equation (1): = × I I – I I 100% SCC air corrosion air (1) where I air was based on test parameters in the air (R e , R m , A, Z, P); and I corrosion was based on test parameters in the corrosive medium (R e , R m , A, Z, P). R e is yield strength, R m is tensile strength, A is elongation, Z is the section shrinkage, and P is the inner product. In this test, I SCC was expressed with a SCC sensitivity index of P (inner product). When I SCC >35%, the system has a high stress corrosion tendency ; when 25%

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