Work

Investigation of Surface Stability and Behavior of Diamalloy 2002 Hard Coatings Under High-Temperature Conditions

Year: 2025

Type: article

Abstract: The high-temperature and hot corrosion behavior of Diamalloy 2002 coatings with a WC/Co–NiCrFeBSiC composite structure applied to a 316 L stainless steel surface using the atmospheric plasma spraying (APS) method was investigated. The coatings were held at 900 °C in air for 5, 25, 50, and 100 h and in a molten salt bath of Na2SO4 + V2O5 at 900 °C for 1, 3, and 5 h. SEM, EDS, and XRD analyses revealed that the oxide layer on the surface thickened with increasing temperature and corrosion duration, forming NiO, Cr2O3, and mixed metal oxides. These oxide phases created a protective barrier effect by limiting diffusion between the coating and the substrate. Despite a slight increase in porosity and minor WC dissolution under long-term oxidation conditions, the coatings maintained their structural integrity up to 900 °C, demonstrating significant resistance to high-temperature oxidation and molten salt corrosion. These results demonstrate that Diamalloy 2002 coatings provide an effective surface protection solution in abrasive and oxidizing high-temperature environments.

Source: Metals

DOI: 10.3390/met15111169

Authors: Yildiz Yarali Ozbek, Okan Odabas, Gulfem Binal, Yasin Ozgurluk, Abdullah Cahit Karaoglanli

Institutions: Sakarya University, Bartin University

Language: English

Topic: High-Temperature Coating Behaviors

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,137

Funders: Sakarya Üniversitesi, Bartin Üniversitesi