Improving wear and corrosion resistance of Ti-alloyed nodular cast irons by Al₂O₃ and SiC-reinforced Al₂O₃ coatings

Kurtuluş V., Görgülü B., Eraslan F. S., GECÜ R.

Surface and Coatings Technology, cilt.498, 2025 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 498
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.surfcoat.2025.131809
  • Dergi Adı: Surface and Coatings Technology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Al₂O₃, Corrosion, Ductile iron, SiC, Sol-gel, Titanium, Wear
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

Nodular cast irons, known for their superior mechanical strengths, have been extensively utilized in the automotive, energy, and various other industries. However, these materials require additional surface quality enhancements in highly abrasive environments. This study uses the sol-gel method to investigate the development and application of Al₂O₃ and SiC+Al₂O₃ coatings on GGG40 nodular cast irons containing 0.5 wt% Ti. The primary objective is to explore the microstructural changes, wear resistance, and corrosion resistance imparted by these coatings. Experimental results reveal that adding Ti modifies graphite morphology, enhancing the wear resistance by approximately 45 % of the cast iron. The Al₂O₃ coating reduced the wear rate of the cast iron by up to 47 % and corrosion rate by 75 %, while SiC-reinforced coating reduced the wear rate by up to 69 % and corrosion rate by 38 %. The findings indicate that incorporating SiC into Al₂O₃ coating provides superior wear resistance, while pure Al₂O₃ coating offers better corrosion resistance.