PDF(Pubmed)
Abstract：
The present work aims to provide corrosion performance data for an additively manufactured Ti6Al4V alloy in saline and polluted environments. The as-received additively manufactured material underwent heat treatment at 850 °C for 3 h to transform the acicular α\' microstructure into a lamellar α microstructure. Comparative corrosion assessments were conducted between the heat-treated substrates, the as-received condition, and a conventionally mill-annealed alloy. Potentiodynamic polarization experiments were carried out in saline (3.5 wt.% NaCl) and acid aqueous media ((NH4)2SO4 containing Harrison\'s solution). The corrosion performance of additively manufactured substrates matched or surpassed that of the conventional alloy in Harrison\'s solutions while remaining inferior in saline medium, despite forming a thicker passive film. Overall, the XY plane showed better corrosion performance, particularly after the elimination of the acicular α\' martensite by the applied heat treatment. The results also suggested that the presence of the coarse β phase was beneficial in 3.5 wt.% NaCl solution and detrimental in Harrison\'s solutions, more so in acidified and fluorinated conditions.
摘要：
本工作旨在提供在盐水和污染环境中增材制造的Ti6Al4V合金的腐蚀性能数据。收到的增材制造材料在850°C下热处理3小时，以将针状α\'微观结构转变为层状α微观结构。在热处理的基材之间进行了比较腐蚀评估，收到的条件，和常规轧制退火合金。在盐水（3.5wt。%NaCl)和酸性水性介质(含有哈里森溶液的(NH4)2SO4)。增材制造基材的腐蚀性能与哈里森溶液中的常规合金相匹配或超过常规合金的腐蚀性能，而在盐水介质中仍然较差，尽管形成较厚的钝化膜。总的来说,XY平面显示出更好的腐蚀性能，特别是在通过施加热处理消除针状α马氏体之后。结果还表明，粗β相的存在在3.5wt。%NaCl溶液和哈里森溶液中的有害溶液，在酸化和氟化条件下更是如此。
