ABSTRACT Nickel-Titanium (Nitinol) alloy is one of the shape memory alloys with potential applications in biomedical and aerospace industries. However, long-term deployment of nitinol-based alloys in fluid medium leads to corrosion. In an attempt to improve the corrosion resistance, electrochemical studies were performed on laser processed nitinol in the presence of simulated body fluid. Design of experiments technique of central composite design was used to formulate the five levels of the three laser processing parameters for surface texturing including average power, pulse frequency, and laser irradiation per unit area. The output responses such as corrosion potential, corrosion current, and corrosion rate were evaluated using response surface methodology. The linear and nonlinear interaction effects of the processing parameters on the output responses were analyzed. A decrease in the corrosion rate of three orders of magnitude was observed in laser processed nitinol in comparison to pristine nitinol.

中文翻译：

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优化激光参数以提高镍钛诺的耐腐蚀性

摘要 镍钛（Nitinol）合金是一种形状记忆合金，在生物医学和航空航天工业中具有潜在应用。然而，在流体介质中长期使用镍钛诺基合金会导致腐蚀。为了提高耐腐蚀性，在模拟体液的存在下对激光加工的镍钛诺进行了电化学研究。采用中心复合设计实验设计技术，制定了表面织构的三个激光加工参数的五个水平，包括平均功率、脉冲频率和单位面积的激光辐照量。使用响应面方法评估输出响应，例如腐蚀电位、腐蚀电流和腐蚀速率。分析了处理参数对输出响应的线性和非线性交互作用。与原始镍钛诺相比，在激光加工的镍钛诺中观察到腐蚀速率降低了三个数量级。