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
Pagination
2251 - 2259
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