Influence of Ca<sup>2+</sup>in Deicing Salt on the Corrosion Behavior of AM50 Magnesium Alloy

Grabowski, Michael; Bluecher, Daniel; Korte, Michael; Virtanen, Sannakaisa

doi:10.5006/1268

Cited by 8 publications

(4 citation statements)

References 74 publications

(106 reference statements)

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“…6b). The deposition velocity is equal to the deposition rate of SO 2 on the sample surface (g/m 2 s) divided by the concentration of SO 2 in the gas (g/m 3 ). Thus, the unit of the quotient is ms −1 .…”

Section: Gravimetric Results-mentioning

confidence: 99%

“…SO 3 2− (aq) + Mg 2+ (aq) ← → MgSO 3 (ads) [3] MgSO 3 (ads) + 6H 2 O(ads) → MgSO 3 .6H 2 O(s) [4] In this way the process of Mg oxidation by O 2 in combination with SO 2 deposition becomes self-sustained. It is conceivable that under some circumstances Mg sulfite may passivate the surface.…”

Section: Discussionmentioning

confidence: 99%

“…The deposition rate (ng/cm 2 s) and the deposition velocity (cm/s) on the samples were determined by measuring the difference between the input and output concentrations of the pollutants. The deposition velocity V d was defined as the flux of an air pollutant to a surface, divided by the concentration in the gas: V d = F/c where F is the flux to the surface (g/cm 2 s) and c is the concentration of the pollutant in the gas (g/cm 3 ). 39,40 In our exposures, the concentration of the SO 2 was taken as the mean of the input and output concentrations in the cell.…”

Section: Methodsmentioning

confidence: 99%

“…However, Mg alloys are sensitive towards corrosion and exhibit the lowest corrosion potentials among the engineering metals. [1][2][3][4] Also, Mg and Mg-Al alloys exhibit high corrosion rates when immersed in NaCl (aq) solution, corrosion being more severe compared to other engineering alloys, including carbon steel. Nevertheless, Mg alloys exhibit somewhat better corrosion properties than steels under atmospheric conditions.…”

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confidence: 99%

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The Influence of SO₂on the Corrosion of Mg and Mg-Al Alloys

Esmaily

Blücher

Lindström

et al. 2015

J. Electrochem. Soc.

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The SO 2 -induced atmospheric corrosion of some magnesium-aluminum (Mg-Al) alloys, including Mg alloy AZ91D, and commercially pure Mg (CP Mg) was investigated using well-controlled laboratory exposures and included real-time measurements of SO 2 deposition. The influence of SO 2 concentration, alloy composition, humidity, and ppb level additions of O 3 or NO 2 on the rate of SO 2 deposition was investigated. SO 2 accelerates the corrosion of Mg and Mg alloys causing localized corrosion, MgSO 3 6H 2 O being the dominant corrosion product. At 60% RH, traces of O 3 or NO 2 strongly increased both the SO 2 deposition and the corrosion rate. The rate of SO 2 deposition was strongly dependent on humidity; at 70% RH and higher the SO 2 deposition rate was very rapid and constant in time while it was transient below 50% RH. At 60% RH, a change from transient to rapid, steady-state, SO 2 deposition occurred. The sudden activation is explained by the onset of electrochemical corrosion. The activation behavior was shown to depend on SO 2 concentration, the thickness of the surface film and by the presence of ambient O 2 . © The Author Magnesium-aluminum (Mg-Al) alloys are widely used as structural materials in many engineering sectors as a result of their good castability and good mechanical properties at room temperature. Due to their low weight/strength ratio, these types of Mg alloys have found widespread applications; from portable microelectronics to automobiles and aircraft. However, Mg alloys are sensitive towards corrosion and exhibit the lowest corrosion potentials among the engineering metals.1-4 Also, Mg and Mg-Al alloys exhibit high corrosion rates when immersed in NaCl (aq) solution, corrosion being more severe compared to other engineering alloys, including carbon steel. Nevertheless, Mg alloys exhibit somewhat better corrosion properties than steels under atmospheric conditions. [5][6][7][8] The causes behind the relatively slow corrosion of Mg-Al alloys in the atmosphere are still not fully clear.Because Mg-Al alloys are often used in atmospheric conditions, a better understanding of the atmospheric corrosion properties is of importance. A large number of parameters affect the atmospheric corrosion process of Mg-Al alloys. Therefore, systematic studies are required to clarify their role on the corrosion. There have been extensive researches on the atmospheric corrosion behavior of Mg alloys using field studies that correlate corrosion rate to selected environmental parameters. [9][10][11][12][13][14][15][16][17][18][19] The variability and complexity of the outdoor atmosphere constitute a major problem when trying to correlate the corrosion rate of a metal to the concentration of, e.g., a particular trace gas in the environment. Laboratory studies under controlled conditions provide the opportunity to study the effect of a specific parameter and/or the synergic effects of atmospheric variable on the corrosion of metallic materials. For example, laboratory investigations have shown that carbon dioxide (CO 2 ...

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Section: Gravimetric Results-mentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%