Extremely high-rate, uniform dissolution of alloy C-22 in anhydrous organic solutions at room temperature
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Teva Branded Pharmaceuticals, Malvern, PA (United States)
- Univ. of Virginia, Charlottesville, VA (United States)
During routine pharmaceutical development and scale-up work, severe corrosion of a Hastelloy Alloy C-22 filter dryer was observed after single, short (several hours) contact with the product slurry at room temperature. Initial investigations showed that the presence of both 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and HCl was sufficient in an acetonitrile solution to cause rapid corrosion of C-22. More detailed mass loss studies showed initial corrosion rates exceeding25 mm/year that then decreased over several hours to steady state rates of 3-5 mm/year. The corrosion was highly uniform. Electrochemical measurements demonstrated that although C-22 is spontaneously passive in acetonitrile solution, the presence of HCl leads to the development of a transpassive region. Furthermore, DDQ is a sufficiently strong oxidizer, particularly in acidic solutions, to polarize the C-22 well into the transpassive region, leading to the observed high corrosion rates.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC04-94AL85000
- OSTI ID:
- 1259672
- Report Number(s):
- SAND-2016-2348J; 621995
- Journal Information:
- Corrosion, Journal Name: Corrosion; ISSN 0010-9312
- Publisher:
- NACE InternationalCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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