摘要
对微弧氧化后的Ti6A14V合金表面进行了水热处理，对处理后涂层的成分、形貌及其在Hank’s模拟体液中的腐蚀性能进行了研究。试验结果表明：水热处理后，微弧氧化层中以无定形态钙磷酸盐存在的Ca、P元素转化为针状羟基磷灰石，厚度约为5μm，并在微弧氧化膜微孔边缘和底部优先生长。与微弧氧化层相比，水热处理后涂层的粗糙度明显下降，同时显微硬度下降约1／3。电化学腐蚀试验表明：微弧氧化显著改善了钛合金在模拟体液中的耐腐蚀性能；水热处理钛合金自腐蚀电位低于纯钛合金，但当处于人体电位0．4～0．6V（VS．SCE）范围时，微弧氧化／水热处理钛合金的腐蚀电流比纯钛合金低1个数量级。
Hydrothermal treatment was carried out on Ti6A14V after microarc oxidation （MAO） , resulting in a composite layer of TiO2 and HA. Composition, morphology and corrosion performance in Hanks＇solution of the composite ceramic layer were characterized. The experimental results show that after hydrothermal treatment, the amorphous Ca, P in MAO layer precipitate into needle-like HA crystals by about 5 μm in thickness which show preferential growth on the edge and bottom of micro-holes in ceramic layer. Surface roughness changes obviously after hydrothermal treatment, and the micro-hardness reduces significantly by about 1/3 in proportion. Electrochemical corrosion experimental results in SBF show that MAO improves the corrosion resistance of Ti6A14V obviously. While E of sample after hydrothermal treatment is lower than that of untreated Ti6A14V, the corrosion current in the range of body potential of 0.4-0.6V （ vs. SCE） is lower than that of the untreated one by one order of magnitude.
出处
《表面技术》
EI
CAS
CSCD
2007年第6期15-17,21,共4页
Surface Technology
基金
国家自然科学基金项目(50535050)
中国矿业大学基金项目(2005B032)
关键词
钛合金
微弧氧化
水热合成
羟基磷灰石涂层
电化学腐蚀
Titanium alloy
Microarc oxidation
Hydrothermal treatment
HA layer
Electrochemical corrosion
