Corrosion protection assessment of sacrificial coating systems as a function of exposure time in a marine environment

Schmidt, Daniel P.; Shaw, B. A.; Sikora, Elizabeth; Shaw, W. W.; Laliberte, Larry

doi:10.1016/j.porgcoat.2006.09.021

Cited by 41 publications

(9 citation statements)

References 10 publications

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“…The concept of sacrificial coating has been advocated and/or implemented in various forms and application areas, such as the manufacture of microfiltration membranes [19] and corrosion protection for metal surfaces [20]. Sacrificial coatings are usually precoated by an external process and eliminated by triggers such as pH or salt concentration [21].…”

Section: Introductionmentioning

confidence: 99%

A New Approach for Mitigating Biofouling by Promoting Online Cleaning Using a Sacrificial Paraffin Coating

Yang

Wilson

Chang

et al. 2014

Heat Transfer Engineering

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The presence of biofouling layers on heat transfer surfaces can reduce heat transfer efficiency markedly. A new method for inhibiting biofouling growth and promoting rapid online cleaning for heat exchangers recovering thermal energy from treated sewage streams based on a temporary coating is reported. A paraffin wax coating is cast in place without needing to disassemble the device, while the low roughness and the hydrophobicity of the coating inhibit bacterial growth. The coating and any attached biofouling can be removed by raising the surface temperature above the wax melting point. The effectiveness of this online cleaning and inhibition strategy was investigated using a simple laboratory test channel, representing a plate heat exchanger, and a process stream simulating treated sewage. The thermal resistance was monitored and showed that the reduction in biofouling thermal resistance eventually outweighed the additional thermal resistance resulting from the coating. A techno-economic analysis is presented to quantify the advantages of the paraffin coating method in terms of energy saving and cost reduction.

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Section: Introductionmentioning

confidence: 99%

A New Approach for Mitigating Biofouling by Promoting Online Cleaning Using a Sacrificial Paraffin Coating

Yang

Wilson

Chang

et al. 2014

Heat Transfer Engineering

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“…[1][2][3][4][5][6][7] These coatings protect substrates either acting as an isolating barrier against corrosive environment or providing electrolytic protection as a sacrificial anodic material or both. 2,3,6 However, certain porosity always exists in these coatings, making penetration of aggressive species much easier and subsequently affecting anticorrosion performances.…”

Section: Introductionmentioning

confidence: 99%

“…As is well known, thermally sprayed coating deposition like pure aluminium coating or Al-Zn coating deposition is one of the most versatile methods to enhance corrosion resistances of substrates including steel, Mg and Al alloys. [1][2][3][4][5][6][7] These coatings protect substrates either acting as an isolating barrier against corrosive environment or providing electrolytic protection as a sacrificial anodic material or both. 2,3,6 However, certain porosity always exists in these coatings, making penetration of aggressive species much easier and subsequently affecting anticorrosion performances.…”

Section: Introductionmentioning

confidence: 99%

“…They are usually sealed for better corrosion protection or wear resistance by sealers like vinyl or epoxy sealers. 4,8 Thermally sprayed coatings are successfully employed to various equipments on off shore facilities like catenary riser flexjoint bodies and to field applications like oil tanks, fuel tanks, steam valves and etc. 9,10 Sometimes, it is not so easy to fulfill the sealing for complex geometries and structures.…”

Section: Introductionmentioning

confidence: 99%

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Study on corrosion resistance properties of hydrothermal sealed arc sprayed aluminium coating

Liu

Song

2010

Surface Engineering

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In this study, traditional hydrothermal sealing (HTS) treatment was for the first time employed to arc sprayed pure aluminium coatings, and proves to be a successful sealing method. Corrosion performances were examined in salt solution immersion test (SSIT) and electrochemical polarisation measurements. The HTS coating is covered with a continuous film of aluminium hydroxide structures, and some deionised water manages to penetrate. Besides, pores in the surface as well as in the inner part get smaller and fewer. In SSIT, the HTS coating has a similar corrosion process to the unsealed one, but corrodes much more slightly. In polarisation curves, the HTS coating exhibits a wide passive region, higher corrosion potential and lower current density than the unsealed coating before immersion. After SSIT, it exhibits small changes in polarisation curves, implying slight corrosion in 90 days immersion and proving much higher corrosion resistance than the unsealed coating in the whole process.

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“…In turn, the aluminum substrate becomes the cathode that is protected [84][85]. Longterm atmosphere exposures and accelerated corrosion tests are widely used to assess different zinc coatings' corrosion resistance [86][87][88]. However, compared with accelerated corrosion tests, performing long-term atmosphere exposures is time-consuming and region dependent.…”

Section: Chapter 2 Literature Reviewmentioning

confidence: 99%

Structural Design and Its Impact on Thermal Efficiency and Corrosion of All-Aluminum Microchannel Heat Exchangers

Ahmed

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In this study, high-fidelity conjugate heat transfer simulations are used to model a micro-channel heat exchanger (MCHE) in a crossflow to study its thermal-hydraulic performance. This study considers three different microchannels (internal flow) geometries (circular, triangular, and square) with louver-shaped fins. The local flow field showed a strong coupling between the microchannel flow, solid domain, and crossflow. The flow separation and wake regions formed near MCHE resulted in a large variation in the velocity field and temperature in the crossflow. The wake region had a significant spanwise variation due to its interaction with fins, which also causes variations in the thermal boundary layer. The heat conduction in the solid structure provided a non-uniform temperature field with a higher temperature near the microchannel and a slightly lower temperature near the surface exposed to the crossflow. The microchannel flow analysis showed that the internal geometry affects the pressure drop, which is highest for the triangular MCHE and lowest for the circular MCHE. However, the microchannel flow temperature change was relatively similar for all microchannels. Results showed that for the same volume of the microchannel, the circular shape microchannel has a higher performance index value than the triangular and square shapes. This study also considers three different fin (external flow/crossflow) geometries (louver, step, and saw) with the same tube and circular shape microchannel and identifies the corrosion hot spot. Crossflow shows higher temperatures near the boundary layer of the tube, which results in higher corrosion rates. A predicted flow field also identifies crevices between fins and tube surfaces as critical corrosion hot spots often associated with low-velocity regions. Electrochemical impedance spectroscopy (EIS) analysis was done on AA3102 (Alloy used in the circular channel and louver fin) alloy in corrosive environments containing low and high concentrations of the combination of sodium chloride and ammonium sulfate. Electrolytes used in this research have pH values ranging from 4.0 to 5.8, closer to nearly neutral environments encountered in many atmospheres. EIS results are presented, including Rsol, Rpore, and Rct of AA3102 with very thin arc evaporated porous Zinc film on AA 3102 along with their equivalent circuit.

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Corrosion protection assessment of sacrificial coating systems as a function of exposure time in a marine environment

Cited by 41 publications

References 10 publications

A New Approach for Mitigating Biofouling by Promoting Online Cleaning Using a Sacrificial Paraffin Coating

A New Approach for Mitigating Biofouling by Promoting Online Cleaning Using a Sacrificial Paraffin Coating

Study on corrosion resistance properties of hydrothermal sealed arc sprayed aluminium coating

Structural Design and Its Impact on Thermal Efficiency and Corrosion of All-Aluminum Microchannel Heat Exchangers

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