Abstract
In this paper, the corrosion residual strength of the AZ91D magnesium alloy in the presence of sulfate-reducing bacteria is studied. In the experiments, the chemical composition of corrosion film was analyzed by a scanning electron microscope with energy dispersive X-ray spectroscopy. In addition, a series of instruments, such as scanning electronic microscope, pH-meter and an AG-10TA materials test machine, were applied to test and record the morphology of the corrosion product, fracture texture and mechanical properties of the AZ91D magnesium alloy. The experiments show that the sulfate-reducing bacteria (SRB) play an important role in the corrosion process of the AZ91D magnesium alloy. Pitting corrosion was enhanced by sulfate-reducing bacteria. Corrosion pits are important defects that could lead to a significant stress concentration in the tensile process. As a result, sulfate-reducing bacteria influence the corrosion residual strength of the AZ91D magnesium alloy by accelerating pitting corrosion.
Highlights
Magnesium alloys are widely used in the automotive industry and civil industry to replace conventional metallic materials, which is attributed to their excellent castability and machinability [1,2,3,4,5,6]
After 60 h of immersion, a number of corrosion pits appeared on the surface of the samples that were immersed in the sulfate-reducing bacteria (SRB) corrosion medium
The sample immersed in the SRB corrosion medium was corroded seriously, and many corrosion pits appeared due to rapid corrosion
Summary
Magnesium alloys are widely used in the automotive industry and civil industry to replace conventional metallic materials, which is attributed to their excellent castability and machinability [1,2,3,4,5,6]. Bad corrosion resistance still restricts the application of AZ91D magnesium alloy [10,11,12,13,14]. In previous studies [15,16,17], it was found that pitting corrosion has a remarkable influence on the mechanical properties of magnesium alloy. In some situations, this pitting corrosion might last for a long time until the structure components fail. Bacterial metabolism is an important factor that influences the corrosion behavior of magnesium alloy
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