TY - JOUR
T1 - Evaluation of properties in steel with boride coatings under hydrogen
AU - Perrusquia, N. López
AU - Ruiz, M. A.Doñu
AU - Miguel, C. R.Torres San
AU - Mendoza, G. J.Pérez
AU - Suarez, J. V.Cortes
AU - Loran, A. Juanico
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/11/15
Y1 - 2019/11/15
N2 - In this study present the benefit of boride coating on surface of ASTM A-36 steel and the evaluation of the properties of the hard coatings under hydrogen permeation. The ASTM A-36 steel was surface hardened by diffusion boron atoms at temperature at 950 °C for 3, 5, and 7 h using the dehydrated boron paste-pack method. The hard coatings obtained on surface A-36 steel were examined using scanning electron microscopy combined with energy dispersive spectrometry and X-ray diffraction. In addition, the hydrogen was introduce into samples with hard coating through cathodic charging applying a current density of 50 mA/cm2 by 0.5 M sulfuric acid solution kept at a room temperature. Three-point bending and instrument nanoindentation were evaluated on sample borided before and after hydrogen charged. Microstructural characterization revealed bilayer (FeB + Fe2B) coatings with saw-tooth morphology and the thicknes values of FeB and Fe2B were in range of 25.30 to 45.3 μm and 77.09 to 187.10 μm, respectively. After hydrogen charged, the microstructure delayed the diffusion of hydrogen, reducing the formation of cracks by increasing the FeB and Fe2B coatings. However. the hardness of the samples tends to increase while the elastic modulus decrease. As well as the static load by bending test decrease due to steel ASTM A-36‑hydrogen interaction.
AB - In this study present the benefit of boride coating on surface of ASTM A-36 steel and the evaluation of the properties of the hard coatings under hydrogen permeation. The ASTM A-36 steel was surface hardened by diffusion boron atoms at temperature at 950 °C for 3, 5, and 7 h using the dehydrated boron paste-pack method. The hard coatings obtained on surface A-36 steel were examined using scanning electron microscopy combined with energy dispersive spectrometry and X-ray diffraction. In addition, the hydrogen was introduce into samples with hard coating through cathodic charging applying a current density of 50 mA/cm2 by 0.5 M sulfuric acid solution kept at a room temperature. Three-point bending and instrument nanoindentation were evaluated on sample borided before and after hydrogen charged. Microstructural characterization revealed bilayer (FeB + Fe2B) coatings with saw-tooth morphology and the thicknes values of FeB and Fe2B were in range of 25.30 to 45.3 μm and 77.09 to 187.10 μm, respectively. After hydrogen charged, the microstructure delayed the diffusion of hydrogen, reducing the formation of cracks by increasing the FeB and Fe2B coatings. However. the hardness of the samples tends to increase while the elastic modulus decrease. As well as the static load by bending test decrease due to steel ASTM A-36‑hydrogen interaction.
KW - Bending test
KW - Boride coatings, Nanoindentation
KW - Hydrogen permeation
UR - http://www.scopus.com/inward/record.url?scp=85072178568&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2019.08.009
DO - 10.1016/j.surfcoat.2019.08.009
M3 - Artículo
SN - 0257-8972
VL - 377
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 124880
ER -