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


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

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In