Corrosion behavior of cast titanium with reduced surface reaction layer made by a face-coating method.
Corrosion behavior of cast titanium with reduced surface reaction layer made by a face-coating method.
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DOI：
10.1016/s0142-9612(03)00063-2
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发表时间：
2003-11
期刊：
影响因子：
14
通讯作者：
M. Koike;Z. Cai;H. Fujii;M. Brezner;T. Okabe
中科院分区：
文献类型：
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作者：
M. Koike;Z. Cai;H. Fujii;M. Brezner;T. Okabe
研究了表面涂层法制备的铸造纯钛的腐蚀行为。在用MgO基包埋料包埋之前，用Y2 O3或ZrO 2的氧化物浆料涂覆蜡模。测试了三种表面制备：研磨、喷砂和铸态。未涂覆的铸件作为对照。在37°C下在充气的改性Tani-Zucchi合成唾液中进行16小时开路电位（OCP）测量、线性极化和动电位阴极极化。在相同的脱气介质中进行阳极极化。测定了极化电阻（Rp）和塔菲尔斜率。计算每个试样的腐蚀电流密度。对结果（n=4）进行非参数统计分析（α=0.05）。通过光学显微镜检查铸型标本的横截面。在表面以下的不同深度处进行能量色散光谱（EDS）斑点分析。所有样本的OCP均在数小时内稳定。不同表面的阳极极化行为存在明显差异。一个独特的广泛的被动区域，然后击穿被视为与地面和喷砂表面的标本。每组的对照组和两个表面涂层组之间的耐腐蚀性没有显著差异。Mann-Whitney检验表明，地面的OCP显著降低，Rp值显著升高。表面状况对腐蚀行为的影响明显大于表面涂层方法。在大多数情况下，铸态表面的试样在动电位阳极极化过程中表现出最小的耐腐蚀性。
This study characterized the corrosion behavior of cast CP titanium made with a face-coating method. Wax patterns were coated with oxide slurry of Y2O3or ZrO2before investing with a MgO-based investment. Three surface preparations were tested: ground, sandblasted, and as-cast. Uncoated castings served as controls. Sixteen-hour open circuit potential (OCP) measurement, linear polarization and potentiodynamic cathodic polarization were performed in an aerated modified Tani-Zucchi synthetic saliva at 37°C. Anodic polarization was conducted in the same deaerated medium. Polarization resistance (Rp) and Tafel slopes were determined. Corrosion current density was calculated for each specimen. Results (n=4) were subjected to nonparametric statistical analysis (α=0.05). Cross sections of cast specimens were examined by optical microscopy. Energy dispersive spectroscopy (EDS) spot analysis was performed at various depths below the surface. The OCP stabilized within several hours for all the specimens. Apparent differences in anodic polarization behavior were observed among the different surfaces. A distinctive wide passive region followed by breakdown was seen on specimens with ground and sandblasted surfaces. There were no significant differences in the corrosion resistance among the control and the two face-coating groups for each group. The Mann–Whitney test showed significantly lower OCP and higher Rpvalues for ground surfaces. The surface condition significantly affected the corrosion behavior more than the face coating methods. In most cases, specimens with as-cast surfaces exhibited the least corrosion resistance during the potentiodynamic anodic polarization.