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Magnesium alloy microbial corrosion method based on solid medium

A technology of solid medium and microbial corrosion, which is applied in the fields of biochemical equipment and methods, microbial measurement/inspection, weather resistance/light resistance/corrosion resistance, etc. Intuitive results, saving experimental drugs, and the effect of saving experimental drugs

Inactive Publication Date: 2008-07-23
JILIN UNIV
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

However, when studying the microbial corrosion of magnesium alloys in a liquid medium, it is difficult to complete the in-situ observation of microbial corrosion due to the fast diffusion of ions in the liquid medium

Method used

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  • Magnesium alloy microbial corrosion method based on solid medium
  • Magnesium alloy microbial corrosion method based on solid medium

Examples

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example 1

[0050] Using this method to study the microcorrosion of AZ91 magnesium alloy, it is found that the main feature of microbiological corrosion of AZ91 magnesium alloy is pitting corrosion (see Figure 3). By comparing the 24h corrosion morphology under sterile and sterile conditions (Figure 2 and Figure 3). Prove that bacteria can indeed cause pitting corrosion of AZ91 magnesium alloy. The morphology of pitting is similar to that of bacterial colonies. It can be seen from Figure 3 that the metabolism of bacterial colonies is particularly serious for the corrosion of magnesium alloys. Under the scanning electron microscope, the relationship between the position of the bacterial colony and the position of the corrosion pit in the corrosion morphology obtained by the patch corrosion method can be clearly observed. It can be deduced that the metabolism of the bacterial colony has an important influence on the corrosion pit. Fig. 4 is the polarization curve measured after the magne...

example 2

[0052] The effect of β phase content on the microbial corrosion of Mg-Al-Zn alloys was studied through the microbiological corrosion of AZ31, AZ51 and AZ71 magnesium alloys by chip corrosion method. Figure 5 shows the corrosion morphology of AZ31 magnesium alloy in the presence of sulfate-reducing bacteria for 24 hours. It can be seen from Figure 5 that the surface of the AZ31 magnesium alloy electrode has been severely corroded, especially the α phase, and the corrosion product film has cracked and formed larger plates. It can be concluded from the morphology that a thick corrosion product film has formed on the surface of the electrode. At the same time, a white substance is attached to the surface of the alpha phase, and the existence of bacterial cells can be clearly seen in the white substance. The white film layer is the reaction product of bacterial metabolites and magnesium alloy electrodes. Figure 6 shows the corrosion morphology of AZ51 magnesium alloy electrode in...

example 3

[0055] Figure 9 and Figure 10 show the morphology micrographs of the microbial corrosion of the Ce-modified AZ91 magnesium alloy. The picture shows the corrosion morphology of the Ce-modified AZ91 magnesium alloy at 24 h when sterile. Figure 10 shows the microbiological corrosion morphology of Ce-modified AZ91 magnesium alloy at 24h. As can be seen from Figure 10, the distribution of bacteria and the way they divide. Through the comparison of Figure 9 and Figure 10, the influence of the existence of sulfate-reducing bacteria and their metabolism on the corrosion process of the Ce-modified AZ91 magnesium alloy can be obtained.

[0056] Therefore, it can be seen from the above examples that the patch corrosion method is an effective research method for the study of microbial corrosion of magnesium alloys.

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Abstract

The invention relates to a sulfate reducing bacteria microbe corrosion method of magnesium alloy, for resolving the microbe corrosion problem of magnesium alloy and combining the microbe cultivation technique and microbe corrosion technique of solid culture medium to provide a novel magnesium alloy microbe corrosion method based on solid culture medium. The method comprises (1) processing and disinfecting sample, (2) arranging and disinfecting a solid culture medium, (3) cultivating and activating bacterial, (4) corroding paster. The invention optimizes the components of electrolyte to highlight the bacterial performance in the corrosion process of magnesium alloy, and compares the electrode surface corrosion morphology with bacterial and without bacterial, to provide the reference for magnesium alloy microbe corrosion mechanism research. The inventive method is suitable for magnesium alloy microbe corrosion research.

Description

Technical field: [0001] The invention relates to a sulfate-reducing bacteria microbial corrosion method for magnesium alloys, in particular to a solid medium-based magnesium alloy microbial corrosion method. The method adopts the patch corrosion method, which is mainly used as a method for microbial corrosion of magnesium alloy components in humid environments where sulfate-reducing bacteria may exist and in environments where organic substances exist. Background technique: [0002] The phenomena that are caused by the life activities of microorganisms or promote the corrosion of materials are collectively referred to as microbial corrosion (MIC). Any facility in contact with water, soil or humid air may encounter microbial corrosion. Power plant cooling water circulation system, heat exchange system, oil extraction, storage and transportation system, sewage treatment pipeline, drinking water pipeline, aircraft fuel storage tank, paper mill equipment, metal cutting fluid ha...

Claims

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Application Information

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IPC IPC(8): G01N17/02C12Q1/02
Inventor 刘耀辉王强宋雨来
Owner JILIN UNIV
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