Abstract
Calcium phosphates were electrochemically deposited on stainless steel, titanium, and copper metal substrates with modified simulated body fluid of pH adjusted from 4 to 10 at 25 - 65 °C while maintaining cathodic potentials at -1.2 to -1.8 V (vs. SCE). The coatings were characterized by powder x-ray diffraction, scanning electron microscopy, and linear polarization corrosion method. X-ray diffraction show depositions in electrolytic solutions of pH below 8 contain hydroxyapatite along with a significant amount of impurities; however at pH 10 the deposit primarily consists of hydroxyapatite with little impurity, ideal for orthopedic implants. As the pH increases the morphology changes as shown with scanning electron microscopy, from an amorphous to a dense crystalline phase. Linear polarization and Tafel plot show surgical stainless steel has the most improvement in anticorrosion when coated with hydroxyapatite.
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