Corrosion behavior of 3C magnesium alloys in simulated sweat solution

Abstract

AZ series Mg alloys AZ31, AZ61, and AZ80 are widely applied in 3C (computer, communication, and consumer electronic) industry. Their corrosion characters in simulated sweat solution have been investigated by electrochemical technology, surface analysis, and pH measurements. Electrochemical test results showed that the three magnesium alloys revealed different corrosion resistance (R t ) in simulated sweat solution, R t(AZ31) < R t(AZ61) < R t(AZ80) . Three major components of simulated sweat solution played different roles during corrosion processes. Lactic acid was a kind of strong erosive medium for the magnesium alloys, and NaCl can induce pitting corrosion on alloys surface, while urea acted as a corrosion inhibitor. The corroded surface morphology of the three magnesium alloys was observed using scanning electron microscopy (SEM) and corrosion products were analyzed by X-ray diffraction (XRD). Result of pH measurement tests showed that there were differences in climbing speed and final values of pH for the three magnesium alloys in simulated sweat solution.

Influence of hydrogen bubbles adhering to the exposed surface on the corrosion rate of magnesium alloys AZ31 and AZ61 in sodium chloride solution

“…The Nyquist diagrams (Fig. ) obtained for the two alloys immersed in 0.6 M sodium chloride solution show the presence of two well‐defined loops: HF (capacitive loop in the high frequency region) and LF (capacitive loop in the low frequency region) . Figure shows the representative impedance spectra of the tested specimens in term of Bode plots.…”

“…In the literature about the corrosion of magnesium alloys is normal to associate the diameter of the capacitive semi‐circle with the charge transfer resistance ( R T ) of the corrosion process , value which is inversely related to the corrosion current ( i corr ) through the well known Stern–Geary equation : …”

Research Progress on Corrosion Resistance of Magnesium Alloys with Bio-inspired Water-repellent Properties: A Review

“…Magnesium alloy has the advantages of light weight, high specific strength and specific rigidity, good shock absorption performance, excellent electrical and thermal conductivity, and is easy to cut and renewable [1][2][3][4][5][6] . It is recognized as the most promising lightweight and green engineering material, and has many potential applications and increasingly positive development prospects in the fields of aerospace, transportation, electronic devices, biomedicine, and our daily life [7][8][9][10][11] . Magnesium and its alloys are expected to become alternative materials for other traditional metals by virtue of abundant resources and many excellent properties [12][13][14][15] .…”

Accelerated degradation rate of AZ31 magnesium alloy by copper additions

“…Mg‐based alloys are promising structural materials for automotive, aerospace industries, biomedicine, and other fields due to their desirable properties such as low density, high specific strength, excellent electrical conductivity, and preferable biodegradability . However, magnesium suffers from poor corrosion resistance due to (1) its high oxygen affinity and (2) low Pilling–Bedworth ratio (0.81) .…”