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<p>The combination of hydroxyapatite (HA) and Mg have excellent osteogenic performance. However, the corrosion resistance and adhesion of hydroxyapatite coating on Mg alloys fabricated by cold spraying are low. Consequently, treatment at 350, 400 and 450&#xa0;°C for 5&#xa0;h was adopted to solve these problems. Thereafter, microstructural characterization, electrochemical analysis, immersion test and cell cytotoxicity test were performed. The results showed that with increase in the heat treatment temperature, the HA coating became more compact even with lesser cracks. Moreover, the corrosion resistance of the HA-coated samples increased obviously after heat treatment. Meanwhile, after the 450&#xa0;°C treatment, the corrosion current density was only 1.30 ± 0.42&#xa0;μm, which meant that the corrosion resistance was improved by about 20 times compared with the untreated HA-coated sample. Moreover, the cell viability of the extract co-cultured with Murine calvarial preosteoblasts cells (MC3T3-E1) increased with the increase in the heat treatment temperature. The samples, after 450&#xa0;°C treatment, exhibited the highest cell viability with the RGR value exceeding 98% after 5&#xa0;days. Thus, the HA-coated sample with 450&#xa0;°C treatment exhibited the best application prospect.</p>

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Effect of Heat Treatment on the Corrosion Resistance and Cytocompatibility of Hydroxyapatite Coating on Mg alloys Fabricated by Cold Spraying

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Jiaqi Wang,
  • Jing Meng,
  • Sharafadeen Kunle Kolawole,
  • Muhammad Ali Siddiqui,
  • Junxiu Chen,
  • Bo Yu

摘要

The combination of hydroxyapatite (HA) and Mg have excellent osteogenic performance. However, the corrosion resistance and adhesion of hydroxyapatite coating on Mg alloys fabricated by cold spraying are low. Consequently, treatment at 350, 400 and 450 °C for 5 h was adopted to solve these problems. Thereafter, microstructural characterization, electrochemical analysis, immersion test and cell cytotoxicity test were performed. The results showed that with increase in the heat treatment temperature, the HA coating became more compact even with lesser cracks. Moreover, the corrosion resistance of the HA-coated samples increased obviously after heat treatment. Meanwhile, after the 450 °C treatment, the corrosion current density was only 1.30 ± 0.42 μm, which meant that the corrosion resistance was improved by about 20 times compared with the untreated HA-coated sample. Moreover, the cell viability of the extract co-cultured with Murine calvarial preosteoblasts cells (MC3T3-E1) increased with the increase in the heat treatment temperature. The samples, after 450 °C treatment, exhibited the highest cell viability with the RGR value exceeding 98% after 5 days. Thus, the HA-coated sample with 450 °C treatment exhibited the best application prospect.