Recent research published in ‘Cailiao Baohu’, which translates to ‘Materials Protection’, has unveiled promising advancements in the corrosion resistance of CrCoNi medium entropy alloys, particularly relevant for construction materials exposed to harsh environments. Conducted by a team from the Institute of Vanadium and Titanium at Panzhihua University, including lead authors CHEN Jinliang, HAN Jiaping, and LIU Xiao, the study highlights the significant improvements achieved through specific processing techniques.
The researchers focused on low-temperature rolling at -196°C followed by annealing at 800°C for 30 minutes. This innovative approach demonstrated a remarkable transformation in the alloy’s corrosion resistance when immersed in a 3.5% NaCl solution, a common corrosive agent in construction settings, especially in coastal and industrial environments. “Our findings indicate that while the low-temperature rolled samples initially exhibited poor corrosion resistance, the annealing process led to substantial enhancements,” said CHEN Jinliang.
The study utilized advanced testing methods, including metallographic and transmission electron microscopy, to analyze the microstructural changes that occurred during the annealing process. The results revealed that recrystallization and grain refinement significantly contributed to the formation of a more robust passivation film on the alloy’s surface, increasing the presence of protective compounds such as Cr2O3 and Cr(OH)3. This enhanced passivation film is crucial for preventing corrosion, thereby extending the lifespan of materials used in construction.
With the construction industry increasingly leaning towards materials that can withstand extreme conditions, the implications of this research are profound. The improved corrosion resistance of CrCoNi medium entropy alloys could lead to their adoption in various applications, from structural components in bridges and buildings to protective coatings in marine environments. “This research not only advances our understanding of alloy behavior but also opens up new possibilities for developing more durable construction materials,” added LIU Xiao.
As the construction sector continues to prioritize sustainability and longevity, the insights from this study could pave the way for innovative material solutions that enhance safety and reduce maintenance costs. The potential commercial impacts are significant, suggesting that these advanced alloys may soon become a standard choice for projects requiring high-performance materials.
For further details on this groundbreaking research, you can visit the Institute of Vanadium and Titanium, Panzhihua University.
