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The inhibition of hydrogen embrittlement in SAE 4340 steel in an aqueous environment with the rare earth compound lanthanum 4 hydroxy cinnamate

journal contribution
posted on 01.01.2012, 00:00 authored by Bruce HintonBruce Hinton, Mehdi BehrouzvaziriMehdi Behrouzvaziri, Maria ForsythMaria Forsyth, Rajeev Gupta, Marianne Seter, P 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.

History

Journal

Metallurgical and materials transactions A

Volume

43

Issue

7

Pagination

2251 - 2259

Publisher

Springer New York LLC

Location

New York, N. Y.

ISSN

1073-5623

eISSN

1543-1940

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

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