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Effect of pulse current on structure and adhesion of apatite electrochemically deposited onto titanium substrates

机译:脉冲电流对电化学沉积在钛基体上的磷灰石结构和附着力的影响

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摘要

Apatite films were deposited onto titanium (Ti) metal substrates by an electrodeposition method under a pulse current. Metastable calcium phosphate solution was used as the electrolyte. The ion concentration of the solution was 1.5 times that of human body fluid, but the solution did not contain magnesium ions at 36.5 °C. We used an average current density of 0.01 A/cm2 and current-on time (TON) equal to current-off time (TOFF) of 10 ms, 100 ms, 1 s, and 15 s. The adhesive strength between apatite and Ti substrates were relatively high at TON = TOFF = 10 ms. It is considered that small calcium phosphate (C–P) crystals with low crystallinity were deposited on the Ti surface without reacting with other C–P crystals, H2O, and HCO3- in the surrounding environment. This resulted in relaxation of the lattice mismatch and enhancement of the adhesive strength between the apatite crystals and Ti substrates.
机译:通过电沉积方法在脉冲电流下将磷灰石膜沉积到钛(Ti)金属基板上。使用亚稳磷酸钙溶液作为电解质。该溶液的离子浓度是人体液的1.5倍,但在36.5°C时该溶液不含镁离子。我们使用的平均电流密度为0.01 A / cm2,电流接通时间(TON)等于10 ms,100 ms,1 s和15 s的电流断开时间(TOFF)。在TON = TOFF = 10 ms时,磷灰石和Ti基材之间的粘合强度相对较高。据认为,低结晶度的小的磷酸钙(C–P)晶体沉积在Ti表面上,而不与周围环境中的其他C–P晶体,H2O和HCO3-发生反应。这导致晶格失配的缓解和磷灰石晶体与Ti衬底之间的粘合强度的增强。

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