Galvanic Corrosion Prediction Using Long- and Short-Term Polarization Curves

Hack, HP; Scully, John R.

doi:10.5006/1.3584889

Cited by 29 publications

(9 citation statements)

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“…The four repeated measurements showed reasonable agreement. Hack and Scully [57] indicated that it was necessary to use long-term po- larization curves to adequately predict the galvanic corrosion, and as a consequence, galvanostatic curves were measured. The particular current density values, chosen based on the potentiostatic polarization curves, were applied and the resulting potential was measured as shown by typical curves in figure 8.…”

Section: Polarization Curvesmentioning

confidence: 99%

Experimental Measurement and Computer Simulation of Galvanic Corrosion of Magnesium Coupled to Steel

Jia¹,

Song²,

Atrens³

2007

Adv Eng Mater

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The study of the galvanic corrosion of magnesium becomes increasingly important as the use of magnesium alloys increases rapidly in the auto and aerospace industries due to their advantages of light-weight, adequate mechanical properties and moderate cost. Corrosion, however, limits the application of magnesium alloys. [1][2][3][4][5][6][7] A number of different mechanisms are important for the corrosion. [8][9][10][11][12][13][14] But galvanic corrosion is probably the most important for magnesium because magnesium is the most active structural metal and consequently may suffer serious corrosion when joined to all other common metals of construction, such as aluminum or steel. [1,2,15] Fasteners and their galvanic corrosion is of major concern in automotive applications. [16][17][18] Skar [17] showed that 6000 series aluminum alloy fasteners caused negligible galvanic corrosion of magnesium in the salt spray test. However, steel fasteners are desired for many applications due to their inherently better mechanical properties. Poor compatibility with magnesium was shown by aluminium-coated steel fasteners [18] whereas steel fasteners with zinc or tin-zinc alloy coatings were compatible with magnesium in salt-water exposure. [16] To be able to design a structural component, incorporating galvanic corrosion, it is useful to be able to simulate the galvanic corrosion distribution qualitatively. The research presented in this paper has been undertaken as part of a program to explore that aim. The total corrosion in the area of galvanic corrosion can be considered to be made up of the following two components: (1) galvanic corrosion and (2) self corrosion. The galvanic corrosion is that part of the corrosion, which is directly caused by the coupling of the magnesium to a steel fastener. The self-corrosion is defined as the extra corrosion. Both the galvanic corrosion and the self-corrosion may take the form of more or less general corrosion, or the form of localized corrosion or pitting corrosion.Prior studies of galvanic corrosion of magnesium have been scarce. The earliest study, started in the 1950s by Teeple, [19] investigated the influence of location and climate. This study revealed that different locations produced different corrosion rates because of the different electrolyte properties of the condensed film on the metal surface. [19] Atmospheric galvanic corrosion could be detrimental for magnesium in one location whilst it was almost harmless in another location. This provided helpful information to select magnesium for a particular location. However, the study was time consuming. It is often not practical to wait years to have the test results for each particular service location. Limited studies have addressed the effect of electrolyte on the galvanic corrosion of magnesium. More effort has been focused on general corrosion, particularly on the influence of the ion species in solution, and the influence of cathodic impurity elements in the alloy. [20][21][22][23][24][25][26][27][28] The influence of the ele...

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Section: Polarization Curvesmentioning

confidence: 99%

Experimental Measurement and Computer Simulation of Galvanic Corrosion of Magnesium Coupled to Steel

Jia¹,

Song²,

Atrens³

2007

Adv Eng Mater

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“…Variation in n-a-b polarization response based on the experimental procedure used to obtain this material behavior characteristic have been observed [12]. Variation in physical scale modeling and computational results could be indicative of the intrinstic variation in the polarizaton response.…”

Section: Comparison Of Resultsmentioning

confidence: 95%

“…as well as the material polarization response used in the computational model. Material polarization response curves have been observed to vary based on the experimetal technique used and even to vary with the SCan rate used [12] so variation between computational and experimental results of the order observed is possible. It is also important to thoroughly understand the effects of even what may at first seem minor geometric details.…”

Section: Discussionmentioning

confidence: 99%

Boundary Element Evaluation of ICCP Systems Under Simulated Service Conditions

DeGiorgi

Lucas

ThomasII

et al. 1992

Boundary Element Technology VII

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“…Hack and Scully [40] indicated that it was necessary to use long-term polarization curves to adequately predict the galvanic corrosion, and as a consequence, galvanostatic curves were measured. The particular current density values, chosen based on the potentiostatic polarization curves, were applied Potentiodynamic polarization curves for AZ91D and steel in 5% NaCl solution using a scan rate of 2 mV/s.…”

Section: Polarization Curvesmentioning

confidence: 99%

Boundary element method predictions of the influence of the electrolyte on the galvanic corrosion of AZ91D coupled to steel

Jia

Song

Atrens

2005

Materials and Corrosion

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This research investigated the galvanic corrosion of the magnesium alloy AZ91D coupled to steel. The galvanic current distribution was measured in 5% NaCl solution, corrosive water and an auto coolant. The experimental measurements were compared with predictions from a Boundary Element Method (BEM) model. The boundary condition, required as an input into the BEM model, needs to be a polarization curve that accurately reflects the corrosion process. Provided that the polarization curve does reflect steady state, the BEM model is expected to be able to reflect steady state galvanic corrosion.

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Galvanic Corrosion Prediction Using Long- and Short-Term Polarization Curves

Cited by 29 publications

References 0 publications

Experimental Measurement and Computer Simulation of Galvanic Corrosion of Magnesium Coupled to Steel

Experimental Measurement and Computer Simulation of Galvanic Corrosion of Magnesium Coupled to Steel

Boundary Element Evaluation of ICCP Systems Under Simulated Service Conditions

Boundary element method predictions of the influence of the electrolyte on the galvanic corrosion of AZ91D coupled to steel

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