Fluorine-substituted apatite coating on surface of biologic medical magnesium or alloy thereof and preparation method

Fluorine-substituted apatite coating on surface of biologic medical magnesium or alloy thereof and preparation method

  • CN 101,703,797 B
  • Filed: 12/07/2009
  • Issued: 03/04/2015
  • Est. Priority Date: 12/07/2009
  • Status: Active Grant
First Claim
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1. a preparation method for the fluorine-substituted apatite coating of biologic medical magnesium or its alloy surface, is characterized in that comprising the steps:

  • Step one, prepares deposit fluid, and the composition in deposit fluid described in 1L is;

    0.1mol Ca (NO 3) .4H 2o, 0.05mol NH 4h 2pO 4, 0.01mol NaF, surplus is pure water;

    Step 2, is placed in deposit fluid prepared by step one by bio-medical magnalium AZ91 screw, the pH of adjustment deposit fluid is 3.0, and temperature is 55 DEG C, makes fluorine-substituted apatite coating carry out spontaneous deposition;

    Controlled the structure of coating by electrochemically aided deposition, design parameter is;

    with inert electrode silver electrode for anode, and with AZ91 magnalium for negative electrode is electroplated, control electric current density is 20mA/cm simultaneously 2, whole deposition process is carried out under nitrogen or argon shield, and obtain the needle-like fluorine substituted hydroxy apatite coating that thickness is 2 microns after 2 hours, coating composition is (Ca, Na 2, Mg) 10(PO 4) 6(OH) 2-xf x, substitution value x is 1.4;

    Step 3, the cated magnalium AZ91 of surface coverage of heating steps two gained, at 60 DEG C, heat treatment 2 hours, obtains fluorine-substituted apatite coating.

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