Volume 14, Issue 4 (3-2025)
مهندسی خوردگی 2025, 14(4): 52-52 |
Back to browse issues page
Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:
Akbarinezhad E, Yarandi M R, Vafadar A, Ramezani E. Studying the Effect of Ttempering Heat
Treatment on the Corrosion Susceptibility of
Carbon Steel Weld Zone. مهندسی خوردگی 2025; 14 (4) :52-52
URL: http://journal.ica.ir/article-1-225-en.html
URL: http://journal.ica.ir/article-1-225-en.html
Associate Professor, Coatings Research Group, Industrial Protection Research Division, Research Institute of Petroleum Industry (RIP) & Associate Professor, Coatings Research Group, Industrial Protection Research Division, Research Institute of Petroleum Industry (RIP)
Abstract: (44 Views)
Due to the observation of numerous cases of coating failure in weld areas in some refineries in the
country, the effect of heat treatment as one of the weld preparation processes before coating application
was considered in this study. To investigate the effect of the type of preparation process, the samples
were first subjected to five conditions: no preparation, sandblasting, sandblasting + Tempering heat
treatment, Tempering heat treatment + sandblasting, and Tempering heat treatment in a 100% humidity
test for 24 hours, and no significant difference was observed in the appearance of the samples in terms
of corrosion. For a more detailed examination, metallography of the samples before and after heat
treatment was performed using an optical microscope. Observations of the aforementioned images in
the weld zone showed that the ferrite phase with a Widmann-Stätten structure containing needle-shaped
ferrites and parallel pearlite plates transformed after heat treatment into a needle-shaped ferrite structure
with larger grains and almost no intergranular pearlite plates. Using the scanning Kelvin probe
technique, the small difference in potential difference between the weld zone and the base metal was
investigated. To quantitatively investigate the corrosion properties, electrochemical impedance
spectroscopy was used in a 3% by weight sodium chloride solution at 25°C for 3 hours. It was found
that after tempering heat treatment, the corrosion susceptibility in the joint area was eliminated and the
corrosion behavior of this area became similar to that of the base metal. However, the corrosion rate of
the weld area was still higher than that of the base metal. Finally, the Tafel polarization test in a 3%
sodium chloride solution at 25°C after 4 hours of immersion showed that the corrosion rate of the base
metal was reduced by heat treatment and the corrosion rate in the interface and weld areas became
almost uniform.
country, the effect of heat treatment as one of the weld preparation processes before coating application
was considered in this study. To investigate the effect of the type of preparation process, the samples
were first subjected to five conditions: no preparation, sandblasting, sandblasting + Tempering heat
treatment, Tempering heat treatment + sandblasting, and Tempering heat treatment in a 100% humidity
test for 24 hours, and no significant difference was observed in the appearance of the samples in terms
of corrosion. For a more detailed examination, metallography of the samples before and after heat
treatment was performed using an optical microscope. Observations of the aforementioned images in
the weld zone showed that the ferrite phase with a Widmann-Stätten structure containing needle-shaped
ferrites and parallel pearlite plates transformed after heat treatment into a needle-shaped ferrite structure
with larger grains and almost no intergranular pearlite plates. Using the scanning Kelvin probe
technique, the small difference in potential difference between the weld zone and the base metal was
investigated. To quantitatively investigate the corrosion properties, electrochemical impedance
spectroscopy was used in a 3% by weight sodium chloride solution at 25°C for 3 hours. It was found
that after tempering heat treatment, the corrosion susceptibility in the joint area was eliminated and the
corrosion behavior of this area became similar to that of the base metal. However, the corrosion rate of
the weld area was still higher than that of the base metal. Finally, the Tafel polarization test in a 3%
sodium chloride solution at 25°C after 4 hours of immersion showed that the corrosion rate of the base
metal was reduced by heat treatment and the corrosion rate in the interface and weld areas became
almost uniform.
Keywords: Plain carbon steel - Weld corrosion behavior - Tempering heat treatment, electrochemical
evaluation
Type of Study: Research |
Subject:
General
Received: 2025/08/11 | Accepted: 2025/03/15 | Published: 2025/03/15
Received: 2025/08/11 | Accepted: 2025/03/15 | Published: 2025/03/15
Send email to the article author
| Rights and permissions | |
 |
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
