Stress corrosion behavior of alpha Al bronze (Cu-7%Al) (UNS C61400) was studied in solutions of 0.1 M to 8 M sodium hydroxide (NaOH) under various potentials (–600 mV vs normal hydrogen electrode [NHE] to 800 mVNHE) and slow strain rates. Analysis of the results of time-to-failure (tf), maximum yield stress (σmax), and the morphology of the fracture surface indicates that the alloy resists stress corrosion cracking (SCC) under all test conditions, including those where the alloy undergoes selective dissolution. The susceptibility (S) to SCC in the above tests was ≤ 14% where S combines the ratios of tf and σmax under the test and in air.

Subject
Strain rate, Corrosion resistant alloys, Fracture surfaces, Free corrosion potential, Bronze, Stress, Selective dissolution, Constants, Corrosion behavior, Corrosion resistance, Aluminum alloys, Stress corrosion cracking, Electrode potential
Keywords:
aluminum bronze, caustic alkali, copper, selective dissolution, stress corrosion cracking
NACE International
2001
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