Akande I G, Kazeem R A, Oluwole O O, Jen T C, Akinlabi E T
Department of Automotive Engineering, University of Ibadan, Ibadan, Nigeria.
Department of Mechanical Engineering, University of Ibadan, Ibadan, Nigeria.
Heliyon. 2024 Aug 10;10(16):e36000. doi: 10.1016/j.heliyon.2024.e36000. eCollection 2024 Aug 30.
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.
在当今的汽车、船舶和石化行业，对轻质材料的需求日益增加。因此，需要生产低密度的部件。在这项工作中，通过在锌基体中加入SiN来开发轻质Zn-SiN涂层。按照ASTM A53/A53M标准，在45°C下，在钢样品上制备了最佳涂层，并改变了SiN颗粒和电压。采用动电位极化技术，按照ASTM G3/G102标准，在0.5M硫酸中检测了未涂层（对照）和涂层样品的劣化（腐蚀）性能，即腐蚀速率（CR）和电流密度（j）。通过扫描电子显微镜（SEM）照片和X射线衍射（XRD）图谱研究了样品的微观结构，同时用销盘摩擦磨损试验机和电流表-电压表检测了样品的耐磨性能（按照ASTM G99标准）和电导率。腐蚀实验表明，未涂层的低碳钢试样的腐蚀速率为12.345mm/年，电流密度为1060μA/cm²，而涂层样品的腐蚀速率和电流密度分别为2.6793至4.7975mm/年和231至413μA/cm²。与未涂层样品相比，涂层试样较低的腐蚀速率和电流密度值表明涂层在测试介质中具有优异的钝化能力。样品的SEM照片显示出细化的微观形态，而XRD图谱显示出诸如ZnSiN、ZnNSi、ZnN和ZnNSi等高峰强度晶体，这可能有利于钢的力学性能和耐腐蚀性。此外，耐磨性能研究表明，未涂层样品的摩擦系数在0.1至0.5之间，而涂层试样的摩擦系数在0.05至0.35之间。同样，未涂层钢的磨损体积为0.00508mm³，而涂层试样的磨损体积在0.00266至0.0028mm³之间，这表明在保护装置与钢的界面之间存在高效的强化机制。此外，低碳钢样品的电导率从12.97Ω·cm降低到0.64Ω·cm，这表明涂层提高了钢的电阻率。
