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Treatment method of magnesium or magnesium alloy surface

A treatment method and technology for magnesium alloys, applied in the direction of metal material coating process, etc., can solve the problems of excessive degradation speed, local pH increase, loss of mechanical properties of magnesium and its magnesium alloys, etc. Effects of reduced mechanical property loss, improved corrosion resistance and biological activity

Inactive Publication Date: 2011-02-02
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems that existing magnesium and its magnesium alloys have serious loss of mechanical properties, excessive degradation speed and local pH value increase due to the generation of a large number of hydrogen bubbles in the rapid degradation process, and provide magnesium Or the treatment method of magnesium alloy surface

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  • Treatment method of magnesium or magnesium alloy surface
  • Treatment method of magnesium or magnesium alloy surface

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specific Embodiment approach 1

[0008] Specific Embodiment 1: The treatment method for the surface of magnesium or magnesium alloy in this embodiment is carried out according to the following steps: 1. Place the base metal in acetone or absolute ethanol solution for ultrasonic cleaning for 1-10 minutes, then rinse twice with distilled water, and then dry ; 2. Place the base material treated in step 1 in a NaOH solution with a concentration of 0.05 to 5.0 mol / L and a pH value of 12 to 14 for 0.5 to 24 hours, then rinse it twice with distilled water, and then dry it; 3. The base material treated in step 2 is placed in calcium nitrate solution, and then dipotassium hydrogen phosphate is added dropwise to the solution under the conditions of pH value of 5-7 and temperature of 20-47°C, and then standing for 10min-8h , form a layer of uniform calcium hydrogen phosphate dihydrate layer on the surface of the base metal, then rinse twice with distilled water, and then dry to complete the treatment of the surface of th...

specific Embodiment approach 2

[0011] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, ultrasonic cleaning is performed for 5 minutes. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0012] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that in step 2, the solution is placed in a NaOH solution with a concentration of 0.5-4.0 mol / L and a pH value of 12.5-13.5 for 3-20 hours. Other steps and parameters are the same as in the second embodiment.

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Abstract

A treatment method of magnesium or magnesium alloy surface relates to the treatment method of metal material surface and solves the problems of the existing magnesium or magnesium alloy in application, such as severe mechanical property loss, excessive degradation speed and local pH value increase caused by the generation of large numbers of hydrogen bubbles accompanied with the degradation process. The method comprises the steps of: firstly, washing and drying parent metal; secondly, using NaOH solution for treating the parent metal after washing; and thirdly, forming a dicalcium phosphate dehydrate layer on the surface of the parent metal. Adopting the NaOH solution for treatment, the method can adjust the magnesium or magnesium alloy surface state and transplants parent material for forming hydroxylapatite into a human body, the mechanical property loss is reduced, the degradation speed is slowed, and the pH value is not changed basically; and the method has simple technique and canform uniform hydroxylapatite on the surface of the parent material, without the falling-off phenomenon.

Description

technical field [0001] The invention relates to a method for treating the surface of metal materials. Background technique [0002] Stainless steel and titanium alloys have been widely used clinically as hard bone tissue implant materials. However, because it cannot be degraded and requires a second operation to take it out, it not only brings pain to the patient, but also costs a lot. Magnesium and its alloys can be used as degradable hard tissue implant materials, the degradation products are biocompatible, and the released magnesium ions are beneficial to tissue growth, especially because magnesium and its alloys have a lower elastic modulus, which is more Being close to the human bone will greatly reduce the stress shielding effect, so the mechanical properties of magnesium and its magnesium alloys can meet the requirements of orthopedic implant materials, but the current application of magnesium and its magnesium alloys has serious loss of mechanical properties ( Due ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/07C23C22/78
Inventor 胡津刘广义王川
Owner HARBIN INST OF TECH
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