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首页> 外文会议>STP 1471; Symposium on Titanium, Niobium, Zirconium, and Tantalum for Medical and Surgical Applications; 20051109-10; Washington,DC(US) >Comparative Evaluations of Surface Characteristics of cp Titanium, Ti-6Al-4V and Ti-15Mo-2.8Nb-0.2Si (Timetalreg; 21SRx)
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Comparative Evaluations of Surface Characteristics of cp Titanium, Ti-6Al-4V and Ti-15Mo-2.8Nb-0.2Si (Timetalreg; 21SRx)

机译：cp钛，Ti-6Al-4V和Ti-15Mo-2.8Nb-0.2Si（Timetal®21SRx）的表面特性的比较评估

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摘要

Commercially pure titanium (cpTi), Ti-6Al-4V (Ti64), and Ti-15Mo-2.8Nb-0.2Si (21SRx), with three unique atomic, alpha, alpha-beta, and beta grain structures, respectively, were subjected to three different surface treatments: cleaning, nitric acid passivation, and heat treatment. Experiments were conducted to determine the effects of the type of material and surface modifications on the substrate microstructure, surface oxide composition and thickness, and resultant corrosion behavior. Metallography showed the cpTi groups were an equiaxed single alpha phase material, the Ti64 groups a dual-phase alpha-beta material, and the 21SRx groups an equiaxed beta material. The different surface treatments did not alter the substrate microstructures of any groups. Spectroscopic (AES) results showed typical titanium and titanium alloy spectra with dominant Ti and O peaks for all sample groups, indicative of titanium dioxide. In addition, small Al and Mo peaks were detected throughout the surface oxides of the Ti64 and 21SRx specimens, respectively. AES depth profiling showed no significant difference in the oxide thickness between all the Cleaned and Passivated groups regardless of metal or alloy group. However, all the Heat Treated groups had significantly thicker oxides. In general, corrosion results showed Passivated and Heat Treated groups to have similar corrosion properties and significantly improved corrosion resistances compared to the Cleaned groups. All impedance spectra fit into the Randies equivalent circuit model, and all sample groups exhibited near ideal capacitivc behavior (φ ≈ 90°) expected for titanium and its alloys.
机译：对商业纯钛（cpTi），Ti-6Al-4V（Ti64）和Ti-15Mo-2.8Nb-0.2Si（21SRx）分别具有三个独特的原子，α，α-β和β晶粒结构进行了研究三种不同的表面处理：清洁，硝酸钝化和热处理。进行实验以确定材料类型和表面改性对基材微结构，表面氧化物组成和厚度以及所得腐蚀行为的影响。金相学表明，cpTi组是等轴的单α相材料，Ti64组是双相的α-β材料，21SRx组是等轴的β材料。不同的表面处理不会改变任何组的基底微结构。光谱（AES）结果显示，所有样品组的典型钛和钛合金光谱均具有占优势的Ti和O峰，表明为二氧化钛。此外，分别在整个Ti64和21SRx标本的表面氧化物上检测到小的Al和Mo峰。 AES深度分析显示，所有清洗组和钝化组之间的氧化物厚度均无显着差异，而与金属或合金组无关。但是，所有热处理组均具有明显较厚的氧化物。总体而言，腐蚀结果表明，与清洗组相比，钝化和热处理组具有相似的腐蚀性能，并显着提高了耐腐蚀性。所有阻抗谱均符合兰迪斯等效电路模型，并且所有样品组均表现出钛及其合金预期的接近理想的电容行为（φ≈90°）。

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