Work

Influence of a Plasma Nitriding Treatment on the Corrosion Behavior of API 5L X70 Steel in Simulated Soil Solution

Year: 2025

Type: article

Abstract: In this work, plasma nitriding was carried out to improve the corrosion resistance of API 5L X70 steel. The process was conducted at different treatment times, 4, 6, 8, and 10 h, to determine which one provides greater resistance to corrosion. The conditions under which the nitriding was carried out were as follows: a mixture of 20% N2 and 80% H2 at 3 torr pressure, a current of 2.6 × 10−6 A, a voltage of 360 V, and the temperature inside the plasma chamber was 550 °C. The blank and nitrided materials were characterized using dispersive energy spectroscopy and scanning microscopy to study their morphology and chemical composition. In addition, open potential circuit, electrochemical impedance spectroscopy, and potentiodynamic polarization curves in simulated soil solution were performed to evaluate the materials’ corrosion resistance. The treatment achieved at 10 h presented the greatest corrosion resistance, reducing the corrosion current density up to three orders of magnitude. The thickness reached 678.75 µm for this condition.

Source: Electrochem

DOI: 10.3390/electrochem6040042

Authors: O. A. González Noriega, A. Flores Nicolás, J. Uruchurtu Chavarín, A. Torres Islas, E. C. Menchaca Campos, H. Martínez Valencia

Institutions: Universidad Autónoma del Estado de Morelos, Universidad Autónoma de Baja California, Universidad Nacional Autónoma de México

Language: English

Topic: Surface Treatment and Coatings

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,207

Funder: Universidad Autónoma del Estado de México