Metallurgical and Materials Transactions A

, Volume 43, Issue 7, pp 2251–2259 | Cite as

The Inhibition of Hydrogen Embrittlement in SAE 4340 Steel in an Aqueous Environment with the Rare Earth Compound Lanthanum 4 Hydroxy Cinnamate

  • B. R. W. Hinton
  • M. Behrouzvaziri
  • M. Forsyth
  • R. K. Gupta
  • M. Seter
  • P. G. Bushell


A preliminary study showed that the inhibitor lanthanum 4-hydroxy cinnamate ((La4OHcin)3) at a concentration of 400 ppm prevented the hydrogen embrittlement (HE) of SAE 4340 steel tensile specimens when tested under slow strain rate conditions in a 0.01M NaCl. In the presence of the inhibitor, a complex film formed on the surface of specimens during the slow strain rate test (SSRT), and no corrosion pits were detected. Electrochemical polarization studies indicated that the La(4OHcin)3 acted as an anodic inhibitor in the NaCl solution. This article also discusses the mechanism of HE inhibition by La(4OHcin)3.


Fracture Stress Open Circuit Potential Hydrogen Embrittlement Slow Strain Rate Slow Strain Rate Test 
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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2012

Authors and Affiliations

  • B. R. W. Hinton
    • 1
    • 2
  • M. Behrouzvaziri
    • 1
  • M. Forsyth
    • 2
  • R. K. Gupta
    • 1
  • M. Seter
    • 2
  • P. G. Bushell
    • 3
  1. 1.Department of Materials EngineeringMonash UniversityClaytonAustralia
  2. 2.Institute for Technology, Research and InnovationDeakin UniversityBurwoodAustralia
  3. 3.Department of DefenceDefence Science and Technology OrganisationFishermans BendAustralia

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