Heliyon
Department of Mechanical and Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle, NE1 8ST, United Kingdom.
Published: August 2024
In today's automotive, marine and petrochemical industries, the desire for lightweight materials has increased. Hence, necessitating the production of components with low density. In this work, lightweight Zn-SiN coatings were developed by including SiN in the zinc matrix. The optimal coatings were produced on steel samples at 45 °C and varied SiN particles and voltages following ASTM A53/A53M standard. The deterioration (corrosion) property i.e. corrosion rate (CR) and current density (j) of the uncoated (control) and coated samples were examined in 0.5 M of sulphuric acid using a potentiodynamic polarization technique following ASTM G3/G102 standard. The microstructure of the samples was studied via the SEM micrographs and XRD patterns, while the wear performance resistance (following ASTM G99 standard) and electrical conductivity of the samples were examined with a pin-on-disc tribometer and ammeter-voltmeter. The corrosion experiment indicated that the uncoated mild steel specimen possessed a CR of 12.345 mm year and j of 1060 μA/cm, while the CR and j of the coated samples ranged from 2.6793 to 4.7975 mm year and 231-413 μA/cm, respectively. The lower CR and j values of the coated specimens, relative to the coated sample showed that the coatings possessed superior passivation ability in the test medium. The SEM micrographs of the samples showed refined morphology, while the XRD patterns revealed high peak intensity crystals such as ZnSiN, ZnNSi, ZnN and ZnNSi, which could be beneficial to the mechanical properties and corrosion resistance of the steel. Moreover, the wear resistance study indicated that the COF of the uncoated sample ranged from 0.1 to 0.5, while those for coated specimens ranged from 0.05 to 0.35. Similarly, the uncoated steel exhibited a wear volume (WV) of 0.00508 mm, while the WV of the coated specimens ranged from 0.00266 to 0.0028 mm3, indicating the existence of high strengthening mechanisms between the interface of the protecting device and the steel. Also, the electrical conductivity of the mild steel sample reduced from 12.97 Ωcm to 0.64 Ωcm, indicating that the electrical resistivity of the steel was enhanced by the coatings.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11381612 | PMC |
http://dx.doi.org/10.1016/j.heliyon.2024.e36000 | DOI Listing |
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