An investigation of the effects of polymer binder compositional variables on the corrosion control of aluminum alloys using magnesium-rich primers

Li, Jun; He, Jie; Chisholm, Bret J.; Stafslien, Missy; Battocchi, Dante; Bierwagen, Gordon P.

doi:10.1007/s11998-010-9264-3

Cited by 7 publications

(7 citation statements)

References 10 publications

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“…Li et al investigated the effects of compositional variables associated with formulating a two-component epoxy-amine based Mg-rich primer for protecting alloy AA20224 T3 [51]. An optimized coating composition based on high molecular weight epoxy resin, amide-functional curing agent, epoxy:amine ratio of 1, and Mg volume content of 50% passed over 3,000 hours of ASTM B117 salt spray exposure.…”

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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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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“…In addition, electrochemical studies have been carried out to understand the corrosion protection mechanism supplied by Mg-rich primers in North Dakota State University [14]. Wang et al measured electrochemical impedance spectroscopy (EIS), electrochemical noise and other electrochemical information in accelerating corrosion damage of the Mg-rich coating [15]; Allahar et al used the Transmission-Line model to analyze and explain the EIS data of Mg-rich primer [16]; Li et al studied the effect of composition on Mg-rich primer's protecting performance for Al alloy applied in aircraft using electrochemical technology such as open circuit potential (OCP), EIS and energy spectrum analysis [17].…”

Section: Introductionmentioning

confidence: 99%

Study on preparation of magnesium-rich composite coating and performance enhancement by graft modification of epoxy resin

Zhao

Guo

et al. 2019

Science and Engineering of Composite Materials

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Magnesium (Mg)-rich primer is considered as a substitute for high polluted chromate treatment technology to provide cathodic protection for aluminum (Al) alloy. In this paper, Mg-rich primer with comprehensive properties was prepared by modifying epoxy resin using direct mixing. Specifically, the influence factors on the dispersion of Mg powder in epoxy, the modification of epoxy resin using organic silicones and the performance of Mg-modified epoxy composite coating were studied. The results show that Mg powder with small particle size has a better dispersion in epoxy; The mechanical property such as flexibility and impact resistance decreases with the addition of Mg powder, but which was improved when using modified epoxy as the resin matrix due to introduction of Si-O-Si flexible chain; In addition, the grafting efficiency between hydroxyl terminated polydimethylsiloxane and epoxy resin was improved because of the introduced silane coupling agent like KH550 contains amino group; The electrochemical test results indicate Mg-rich primer could provide effective electrochemical protection for Al alloy by raising the corrosion potential and reducing the corrosion current density to bare substrate,respectively.

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“…MgRPs can provide effective cathodic protection to Al alloys [12,13]. However, since MgRPs are formulated at high pigment volume concentration (PVC) to ensure cathodic protection, they show insufficient barrier properties and require a topcoat to realize good performance [14,15].…”

Section: Introductionmentioning

confidence: 99%

(Mg rich primer-powder topcoat) coating system for the corrosion protection of Al alloys

Lin

Orgon

Battocchi

et al. 2017

Progress in Organic Coatings

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Mg rich primer-powder topcoat) coating system was first developed and characterized in this research for the corrosion protection of Al alloys. Feasibility of using Mg rich primer (MgRP) as an under layer for powder topcoat was proved through evaluating thermal stability of MgRP, adhesion strength of the (MgRP-powder topcoat) coating systems, and cross-section images of the coating systems. In addition, corrosion protection effects of (MgRP-powder topcoat) coating system were evaluated by exposing samples to accelerated weathering test. Electrochemical impedance spectroscopy (EIS) and visual inspection were conducted during exposure. The results show that (MgRP-powder topcoat) coating systems provided much longer corrosion protection time to Al substrate than the powder topcoat alone. Moreover, gloss measurements indicated that for the coating systems tested in this research, using MgRP as an under layer does not affect the final coating appearance.

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An investigation of the effects of polymer binder compositional variables on the corrosion control of aluminum alloys using magnesium-rich primers

Cited by 7 publications

References 10 publications

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

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

Study on preparation of magnesium-rich composite coating and performance enhancement by graft modification of epoxy resin

(Mg rich primer-powder topcoat) coating system for the corrosion protection of Al alloys

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