Pješčić-Šćepanović Jelena, Vastag Gyöngyi, Ivošević Špiro, Kovač Nataša, Rudolf Rebeka
Faculty of Metallurgy and Technology, University of Montenegro, Dzordza Vasingtona bb, 81000 Podgorica, Montenegro.
Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 3, 21 000 Novi Sad, Serbia.
Materials (Basel). 2022 Apr 13;15(8):2841. doi: 10.3390/ma15082841.
This paper gives an approach to the corrosion resistance analysis and changes in the chemical composition of anNiTi alloy in the shape of a disc, depending on different real seawater environments. The NiTi discs were analysed after 6 months of exposure in real seawater environments: the atmosphere, a tidal zone, and seawater. The corrosion tests showed that the highest corrosion rate for the discs is in seawater because this had the highest value of current density, and the initial disc had the most negative potential. Measuring the chemical composition of the discs using inductively coupled plasma and X-ray fluorescence before the experiment and semiquantitative analysis after the experiment showed the chemical composition after 6 months of exposure. Furthermore, the applied principal component analysis and cluster analysis revealed the influence of the different environments on the changes in the chemical composition of the discs. Cluster analysis detected small differences between the similar corrosive influences of the analysed types of environments during the period of exposure. The obtained results confirm that PCA can detect subtle quantitative differences among the corrosive influences of the types of marine environments, although the examined corrosive influences are quite similar. The applied chemometric methods (CA and PCA) are, therefore, sensitive enough to register the existence of slight differences among corrosive environmental influences on the analysed NiTi SMA.
本文给出了一种根据不同实际海水环境对圆盘状镍钛合金的耐腐蚀性分析及其化学成分变化的方法。镍钛圆盘在实际海水环境（大气、潮间带和海水）中暴露6个月后进行了分析。腐蚀试验表明，圆盘在海水中的腐蚀速率最高，因为其电流密度值最高，且初始圆盘的电位最负。在实验前使用电感耦合等离子体和X射线荧光测量圆盘的化学成分，并在实验后进行半定量分析，以显示暴露6个月后的化学成分。此外，应用主成分分析和聚类分析揭示了不同环境对圆盘化学成分变化的影响。聚类分析检测到在暴露期间所分析的环境类型的相似腐蚀影响之间存在微小差异。所得结果证实，主成分分析能够检测出海洋环境类型的腐蚀影响之间的细微定量差异，尽管所研究的腐蚀影响非常相似。因此，所应用的化学计量学方法（聚类分析和主成分分析）足够灵敏，能够记录腐蚀性环境对所分析的镍钛形状记忆合金的影响之间的细微差异。
