Abstracts Book - IMRC 2018

• SE4-O007
EFFECT OF A NON-CONVENTIONAL QUENCHING HEAT
TREATMENT ON THE HYDROGEN ABSORPTION OF ON STEEL API
5L X60
Manuel Alberto Tun Serrano 1 , Jorge Antonio González Sánchez 1 , José Damián Calan Canche 2 ,
Orest Bilyy 1
1 Universidad Autónoma de Campeche, Centro de Investigación en Corrosión, Mexico.
2 Universidad Michoacana de San Nicolás de Hidalgo, Instituto de Investigación en Metalurgia y
Materiales, Mexico.
This work focused on the effect of non-conventional heat treatment on the
corrosion rate (rcorr) and hydrogen absorption of API X60 steel subjected to low
cathodic polarization in a deoxygenated NS4 solution simulating soil. Samples of the
material with dimensions of 4 mm 2 and 0.9 mm thickness were, subjected to two
different quenching heat treatments, the first one, a conventional heat treatment
(CTT) using an austenization temperature of 950 °C for 30 minutes and cooling in
water, the second one was austenized at 1050 °C, a Non-conventional heat
treatment (NCTT). Samples with and without heat treatment were used as working
electrodes for the electrochemical hydrogen charging. To know the electrochemical
behavior of the steels, 2 electrochemical cells were used, and two solutions
deoxygenated with Argon, one simulating soil with neutral pH (NS4) and another
one of 0.2M NaOH with pH = 12.4. For the samples hydrogenations the same NS4
solution was used but the samples were sanded up to 800 grit, after which were
subjected to electrochemical hydrogenation for different periods of
1,2,4,12,24,48,72,96 and 144 hrs applying a cathodic overpotential of -200mV.
Immediately after each hydrogenation period, an electrochemical hydrogen
oxidation was performed in order to determine the amount of hydrogen absorbed
in the solution of 0.2M NaOH at an anodic overpotential of 170 mV vs SCE during a
t = 1hr.
The obtained microstructures are ferrite-perlite of BM(Base Material), of polygonal
ferrite / quasipoligonal-bainite-acicular ferrite of CTT, and of bainite-ferrite acicular
of NCTT. The latter showed smaller rcorr, and lower susceptibility to hydrogen
absorption than the others. The steel with CTT is more active and showed greater
rcorr. In conclusion, it has that the NCTT decreased the rcorr and the susceptibility to
the hydrogen absorption of API X60 steel according to its microstructure.
Keywords: Non-Conventional Heat Treatment, Hydrogen Absorption, Corrosion
Presenting authors email: al035336@uacam.mx