Device and method for detecting evolution of corrosion resistance of coating with deformation of magnesium substrate

Abstract

The invention discloses a device and a method for detecting the evolution of the corrosion resistance performance of a coating with the deformation of a magnesium substrate. The detection device includes a corrosion reaction tank, a sample loading device placed in the corrosion reaction tank, a circulation heating device, and an electrochemical workstation for detecting electrochemical signals during the bending strain of the sample; the simulation of the submerged sample in the corrosion reaction tank The solution in the physiological environment; the circulation heating device is connected with the corrosion reaction tank through the catheter, and provides the solution for simulating the physiological environment at a suitable temperature for the corrosion reaction tank circulation; the sample loading device is connected with the electronic universal testing machine through the connecting rod. The detection device can simulate the bending plastic deformation of the medical magnesium alloy implant material in vitro, and measure the corrosion resistance change of the magnesium alloy surface coating through an electrochemical device during the slow bending strain process. The detection method can dynamically measure the change of electrochemical information of the surface coating in situ, so as to analyze the evolution law of the corrosion resistance and self-healing ability of the surface coating.

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...

AI Technical Summary

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

Images