Materials Performance

JUN 2019

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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Page 18 of 80

16 JUNE 2019 W W W.MATERIALSPERFORMANCE.COM MATERIAL MATTERS determined by mechanical test data of the specif ic material heat. The laboratory uses stringent safety protocols to perform projects in aggressive H 2 S-based environ- ments at low and high pressure and temperatures. At room temperature, the SSC failure mechanism is believed to be a form of hydrogen embrittlement, SwRI says. The specimen is exposed under load to an acidi- fied (pH 2.6 to 2.8) and buffered brine solu- tion (5 wt% sodium chloride [NaCl] and 0.5 wt% acetic acid) that is saturated with 100% H 2 S gas. Testing is performed at 24 °C, plus or minus 3 °C. The environmental cracking susceptibility is evaluated based on a fail- ure test result after 30 days of exposure. As a matter of standard practice, the SwRI team says it plans to provide photo- graphs of any cracks that occur during testing. The researchers will also report online environmental testing conditions, including temperature and oxygen content. In addition to Method A testing, SwRI also has the capability of investigating failed parts at the site using optical meth- ods, scanning electron microscopy, x-ray diffraction, x-ray, and nondestructive techniques such as eddy current and microtomography to obtain a three- dimensional rendition of internal damage. For more information, visit www.swri. org. References 1 "SwRI to Open New Corrosion Testing Facil- ity," Southwest Research Institute Press Releases, March 20, 2019, https://www. testing-facility-nace-ssc (April 24, 2019). 2 NACE TM0177-2016, "Laboratory Testing of Metals for Resistance to Sulfide Stress Crack- ing and Stress Corrosion Cracking in H 2 S Environments" (Houston, TX: NACE Interna- tional, 2016). —Ben DuBose Continued f rom page 15 AUTHORS WANTED NACE is looking for industry experts to write and edit NACE- published books and compilations. Contact Jean Broge +1 281-228-6455

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