Comparison of testing solutions on the protection of Al-alloys using a Mg-rich primer

Battocchi, Dante; Simões, A.M.; Tallman, Dennis E.; Bierwagen, Gordon P.

doi:10.1016/j.corsci.2005.05.059

Cited by 94 publications

(56 citation statements)

References 12 publications

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“…They assumed that the HF loop is because of the corrosion process and the low frequency loop is related to diffusion processes. [18] During our measurements the width of the semicircles increases (Fig. 10a).…”

Section: Eismentioning

confidence: 85%

Manufacturing and corrosion properties of ultrasound supported friction stir welded Al/Mg‐hybrid joints

Benfer

Straß

Wagner

et al. 2015

Surface & Interface Analysis

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a Friction stir welding (FSW) allows to join Al and Mg alloys, which could hardly be welded by other techniques. Within the project a modified FSW process was developed, which uses additionally submitted power ultrasound during the joining of the Al-cast and Mg-cast alloys with the aim to improve the stirring in the welded area and to eliminate the formation of brittle intermetallic phases as coherent layers which reduce the attainable strength of the joints. To understand the development of the microstructure in the bonding zone a detailed analysis has been carried out. The resulting microstructure may influence the corrosion properties, which have been investigated by different methods. Voltapotential differences between the base alloys and the welded area were measured with the Scanning Kelvin Probe. Electrochemical measurements (open circuit potential, impedance spectroscopy and potentiodynamic polarization) were carried out at different positions on the hybrid joints by using an electrochemical minicell (∅ 3 mm). This allows to observe the passivation behavior and corrosion activity of the base alloys and the nugget phase separately. As expected the Mg alloy exhibits a much stronger corrosion in sodium chloride solution than the Al alloy. In the transitional area between the Mg alloy and the nugget phase the overall corrosion rate strongly increases while the corrosion of the nugget is reduced at the expense of the Mg alloy. Differences between hybrid joints processed with and without ultrasound support are discussed.

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Section: Eismentioning

confidence: 85%

Manufacturing and corrosion properties of ultrasound supported friction stir welded Al/Mg‐hybrid joints

Benfer

Straß

Wagner

et al. 2015

Surface & Interface Analysis

View full text Add to dashboard Cite

show abstract

“…The typically high dissolution rate of Mg is significantly decreased by its incorporation in the polymer (a polymeric membrane controlling water, oxygen and electrolytes to varying degrees). In a subsequent paper, the same authors reported the corrosion behavior of the same alloys coated with a magnesium-rich coating, of pure magnesium and of the bare aluminum substrates in 0.1% NaCl solution and dilute Harrison's solution (DHS), assessed using electrochemical techniques [47]. The change from 0.1% NaCl to dilute Harrison solution (DHS) affected the OCP, the corrosion rates and the equivalent circuits of the systems studied.…”

Section: Performance and Mechanism Of Corrosion Protection By Mg-richmentioning

confidence: 99%

Magnesium-Based Sacrificial Anode Cathodic Protection Coatings (Mg-Rich Primers) for Aluminum Alloys

Pathak

Mendon

Blanton

et al. 2012

Metals

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Abstract:Magnesium is electrochemically the most active metal employed in common structural alloys of iron and aluminum. Mg is widely used as a sacrificial anode to provide cathodic protection of underground and undersea metallic structures, ships, submarines, bridges, decks, aircraft and ground transportation systems. Following the same principle of utilizing Mg characteristics in engineering advantages in a decade-long successful R&D effort, Mg powder is now employed in organic coatings (termed as Mg-rich primers) as a sacrificial anode pigment to protect aerospace grade aluminum alloys against corrosion. Mg-rich primers have performed very well on aluminum alloys when compared against the current chromate standard, but the carcinogenic chromate-based coatings/pretreatments are being widely used by the Department of Defense (DoD) to protect its infrastructure and fleets against corrosion damage. Factors such as reactivity of Mg particles in the coating matrix during exposure to aggressive corrosion environments, interaction of atmospheric gases with Mg particles and the impact of Mg dissolution, increases in pH and hydrogen gas liberation at coating-metal interface, and primer adhesion need to be considered for further development of Mg-rich primer technology.

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“…Clays have also been used as swelling agents in paints to heal defects [36]. Th e use of magnesium particles as sacrifi cial anodes has been reported to protect aluminum alloys and steels, undergoing oxidation instead of the underlying metal [37].…”

Section: Approaches For Performance Recovery Of Paintsmentioning

confidence: 99%

Designing green, self-healing coatings for metal protection

et al. 2010

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Metals are used extensively in modern society in a range of applications from infrastructure to aircraft to consumer products. The protection of metals, primarily from corrosion, has been an active area of materials science for many years. However, over the last 20 years, changing regulations governing both environmental issues and human health have driven even greater activity in this fi eld. Addressing these regulatory changes presents some of the most exciting challenges in materials science. This review looks at current metal protection schemes, exploring the development of 'green' inhibitors and 'self-healing' paint fi lms that have inbuilt capacity to maintain functionality. Inorganic and organic materials science has undergone rapid development in recent decades and this review looks at how some of those developments, particularly in encapsulation and polymer healing, can be applied to the design of new protective paint systems.

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Comparison of testing solutions on the protection of Al-alloys using a Mg-rich primer

Cited by 94 publications

References 12 publications

Manufacturing and corrosion properties of ultrasound supported friction stir welded Al/Mg‐hybrid joints

Manufacturing and corrosion properties of ultrasound supported friction stir welded Al/Mg‐hybrid joints

Magnesium-Based Sacrificial Anode Cathodic Protection Coatings (Mg-Rich Primers) for Aluminum Alloys

Designing green, self-healing coatings for metal protection

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