Device and method for detecting evolution of corrosion resistance of coating along with deformation of magnesium base material

Abstract

The invention discloses a device and a method for detecting the evolution of the corrosion resistance of a coating along with the deformation of the magnesium base material. The detection device comprises a corrosion reaction tank, a sample loading device arranged in the corrosion reaction tank, a circulating and heating device and an electrochemical workstation used for detecting electrochemicalsignals in the bending strain process of a sample. The corrosion reaction tank is internally provided with a solution for simulating the physiological environment of the sample. The circulating heating device is connected with the corrosion reaction tank through a guide pipe, and is used for circularly supplying the solution for simulating the physiological environment at a proper temperature to the corrosion reaction tank. The sample loading device is connected with an electronic universal testing machine through a connecting rod. The detection device can simulate the outer bending plastic deformation of a medical magnesium alloy implant material body. The change of the corrosion resistance of the surface coating of the magnesium alloy is measured through an electrochemical device in theslow bending strain process. The detection method can dynamically measure the electrochemical information change of the surface coating in situ. Therefore, the development rule and the self-repairingcapability of the corrosion resistance of the surface coating can be analyzed.

Description

technical field [0001] The invention relates to the technical field of detection devices, in particular to a device and method for detecting the evolution of the corrosion resistance of a coating as a magnesium substrate deforms. Background technique [0002] Biomedical magnesium alloys have attracted the attention of researchers of medical implant materials all over the world because of their mechanical properties similar to those of human bone tissue, complete biodegradability in vivo, and good biocompatibility of degradation products, and have achieved good results. Clinical trial application effect. However, the rapid degradation rate of magnesium alloys in physiological solution environment limits its clinical application. A variety of surface modification technologies are currently applied to the modification of magnesium alloys, by forming an organic or inorganic coating on the surface of magnesium alloys and changing the microstructure of the surface of magnesium al...

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Problems solved by technology

[0004] In the prior art, most of them only measure the corrosion resistance of samples with fixed deformation. However, due to the individual differences in human bone tissue and vascular tissue, it is obviously unrealistic to use a uniform and fixed deformation scale to evaluate the performance of materials.

At the same time, the existing technology has basically not paid attention to the evolution process of the corrosion resistance of magnesium alloy coatings with the deformation of magnesium alloy substrates, and has not used electrochemical techniques to measure the evolution of corrosion resistance of magnesium alloy surface coatings.

Moreover, for the self-repairing coating as a physical shielding layer, the scratch method is mostly used for its self-repairing ability, and the repairing ability of the coating is observed by scanning electron microscopy, and the change of the corrosion resistance of the coating caused by the deformation of the substrate, and Physical shielding self-healing ability, few research methods

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