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Chapter 47
Dissolution and Hydrogen Diffusion Control of IGSCC in Sensitized Aluminum-Magnesium Alloys

Excerpt

Prior research affirmed that the mechanism for intergranular SCC in sensitized Al-Mg alloys in chloride solution requires dissolution of grain boundary β to promote severe crack tip acidification, hydrogen production, and process zone embrittlement. This study establishes two new findings that strengthen this mechanism. First, H precharged-notched specimens of alloy 5083 exhibit grain boundary embrittlement, with or without β. Second, extra-ordinarily high rates of IGSCC are enabled by H diffusion, provided that diffusivity is on the order of 10-7 cm2/s and not reduced by H trapping. Grain boundary embrittlement by precharged H may provide a means to characterize β size and morphology.

  • Introduction
  • Objective
  • Experimental
  • Results
  • Discussion
  • Conclusions
  • Acknowledgements
  • References

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