Detachable gas collection measuring device for biodegradability of medical magnesium alloy

Abstract

The invention discloses a detachable gas collection measuring device for the biodegradability of a medical magnesium alloy. The device comprises a main gas measuring pipe, an auxiliary gas measuring pipe, a gas guide cover, a plug valve and a drainage pipe, wherein the main gas measuring pipe is an independent component of which the upper end is provided with an external thread and the lower end is provided with an internal thread; the gas guide cover is an independent component which has a funnel shape and of which the small end is provide with an external thread fastened with the main gas measuring pipe and matched with the internal thread of the lower end of the main gas measuring pipe; and the lower end of the auxiliary gas measuring pipe is provided with an internal thread fastened with the main gas measuring pipe and matched with the external thread of the upper end of the main gas measuring pipe, and the upper end of the auxiliary gas measuring pipe is connected with the drainage pipe through the plug valve. The device has the advantages of detachability, easy carrying, convenient use, accurate measurement, high generality and the like; and when the device is used, insoluble gases produced in a specific area in a liquid medium can be easily collected in real time and synchronously and accurately measured, and therefore the requirements on fast and accurate measurement of the corrosion resistance and degradability of materials are met.

Description

technical field [0001] The invention belongs to the technical field of material / device performance testing, and relates to a device for real-time collection and synchronous precise quantification of insoluble gas generated in a specific area in a liquid medium by the principle of liquid discharge and gas collection. Background technique [0002] The principle of liquid drainage and gas collection has been widely used in scientific research and experimental teaching. Among them, the hydrogen evolution measurement method used for the evaluation of corrosion protection performance of magnesium alloys, such as biodegradation performance, is a typical case. When magnesium alloys are degraded in water-based media such as seawater and simulated body fluids, the cathodic depolarization reaction is dominated by hydrogen evolution reaction, and the overall reaction equation is as follows: [0003] [0004] If the intermediate steps that may be involved are not considered, the abov...

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Problems solved by technology

[0010] 1) In order to ensure that the funnel and burette can be filled with solution and the gas collected through the funnel can finally enter the burette for measurement, the small end of the funnel must be located in the burette and the mouth of the burette must be below the liquid level, resulting in Funnel position is difficult to control due to inconvenient clamping

Unless relying on a special support device, the funnel can only fall to the bottom of the container to form a relatively closed space with the container, resulting in: A. affecting the substance exchange between the inside and outside of the funnel, and ultimately affecting the performance test results of the sample covered by the funnel ; B. Because it is difficult to adjust the pose of the sample in real time to control its effective working area, it is easy to cause the experiment to fail when the sample happens to fall or fall.

[0011] 2) Due to the blockage of the upper space of the sample by the measuring air tube and the funnel, the conventional simple and easy "suspension" sample loading method cannot be used for sample loading, which causes a series of inconveniences and even affects the experimental results

[0012] 3) Due to the limitation of the shape and specification of the funnel and measuring air tube, the gas collection volume and measurement accuracy are limited at the same time

[0013] 4) Since the conventional measuring gas tube has no length scale, it is inconvenient to measure the liquid level difference inside and outside the tube

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