Method for improving corrosion resistance and wear resistance of surface of magnesium metal
A technology of corrosion resistance and wear resistance, which is applied in the field of surface modification of metal materials, can solve problems such as low wear resistance and restrict application effects, and achieve improved wear resistance, improved corrosion resistance, improved corrosion resistance and The effect of abrasion resistance
Active Publication Date: 2017-11-17
TAIYUAN UNIV OF TECH
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Problems solved by technology
However, in the physiological environment, the degradation rate of magnesium and its alloys is too fast, and the defects of low wear resistance seriously restrict its practical application effect.
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Embodiment 1
[0021] figure 1 Shows the double-glow plasma metalizing furnace equipment used in the present invention, which mainly includes 9 components, namely: 1-anode, 2-source, 3-control board, 4-source power supply, 5-workpiece power supply, 6-workpiece cathode, 7-argon gas, 8-cooling water, 9-vacuum device.
[0022] use figure 1 The shown device tests pure magnesium specimens with a thickness of 3mm and a side length of 10mm×10mm. The operation steps are as follows:
[0023] (1) Magnesium sample pretreatment: Grind the magnesium sample to 1200# with sandpaper, perform mechanical polishing, and then ultrasonically clean it in absolute ethanol.
[0024] (2) Put the pretreated magnesium sample into figure 1 On the sample stage of the shown double-glow plasma metalizing furnace equipment, place the planar graphite target opposite to the sample, and adjust the distance between the target and the sample to 17 cm.
[0025] (3) First use the vacuum device 9 to draw the pressure of the vacuum chamber...
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Abstract
The invention discloses a method for improving the corrosion resistance and wear resistance of the surface of magnesium metal. The method comprises the steps that (1) a magnesium sample is pretreated; (2) the pretreated magnesium sample is put on a sample table of double-glow plasma surface alloying furnace equipment, and the distance between a graphite target and the sample is adjusted to be 15-20cm; (3) the air pressure of a vacuum chamber is vacuumized to be below 5Pa by using a vacuumizing device, then inert gas is introduced to enable the air pressure of the vacuum chamber to be stabilized at 34Pa-36Pa, a bias power supply is turned on, and the voltage of the bias power supply is slowly increased to 550V for sputter cleaning; and (4) residual gas is pumped out after cleaning is completed, inert gas is introduced, when the air pressure of the vacuum chamber is stabilized to 34Pa-36Pa, the bias power supply is turned on, the voltage of the bias power supply is slowly increased to 550V, the voltage difference between the source voltage and the cathode voltage is kept at 250V, heat preservation is carried out for 30 minutes, then cooling is carried out with the furnace for 2 hours, and the inert gas is closed. According to the method, the target distance can be increased, the purposes of heating effect and grain refinement can be achieved, and the damage to the surface of the sample can be reduced.
Description
Technical field [0001] The invention relates to a method for improving the corrosion resistance and wear resistance of the magnesium metal surface, and belongs to the technical field of surface modification of metal materials. Background technique [0002] Magnesium is the lightest metal (density 1.4-1.9 g / cm 3 ). Magnesium and its alloys, as biodegradable biomaterials, can effectively reduce the stress shielding effect when implanted in the body, which is beneficial to the healing of fractures. At the same time, the pain and expense caused by the second operation after the fracture healing can be avoided. Therefore, magnesium and its alloys are expected to become a new generation of biometal materials to replace existing traditional metal materials. However, in the physiological environment, magnesium and its alloys degrade too fast, and the defects of low wear resistance severely restrict their practical application effects. [0003] In order to solve the above problems, there...
Claims
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IPC IPC(8): C23C14/46
CPCC23C14/46
Inventor 王欣赵丽丹于盛旺丁文强
Owner TAIYUAN UNIV OF TECH