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Monday, September 10, 2007

H2_Em

Earlier post << Hydrogen present and it's impact to metallurgy >> has discussed on how Hydrogen attack metal or alloy by reducing its ductility (ability to deform) and some preventive measures. This post will provide listing of standard test method used to a material potentially (or already) expose to hydrogen embrittlement.

Standard Test Methods (NACE, ASTM)
  • NACE TM0177 - laboratory testing of metals for resistance to sulfide stress cracking in H2S environments.
  • NACE TM0284 - evaluation of pipeline and plate steels for resistance to stepwise cracking.
  • ASTM G129 - slow strain rate test for determination of environmentally assisted cracking.
  • ASTM G142 - tension tests in hydrogen environments.
  • ASTM G146 - hydrogen induced disbonding of stainless clad steel plate in refinery hydrogen service.
  • ASTM F-326 - method for electronic hydrogen embrittlement test for cadmium electroplating processes.
  • ASTM F-519 - method for mechanical hydrogen embrittlement testing of plating processess and aircraft maintenance chemicals.
  • ASTM A-143 - practice of safeguarding against embrittlement of hot dip galvanized structural steel products and detecting embrittlement.
  • ASTM B-577 - hydrogen embrittlement of deoxidized and oxygen free copper.

Some guidelines for use of test methods :

  • General purpose - Slow strain rate test methods. Conservative results is expected.
  • High strength material - Constant load test method
  • Low strength material - Non-stressed coupons exposed to testing fluid
  • Material exposed to Hydrogen environment at high temperature - Special testing to be handled by specialist.
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posted by Webworm, 3:32 AM

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