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A Study on Damage Evolution Mechanism of Hex-Chrome Free Coating/Aluminum System and a Proposed 2D Transmission Line Model Based on Experimental Results

Niu, Jiani
http://rave.ohiolink.edu/etdc/view?acc_num=akron1415641540

Abstract Details

2014, Master of Science, University of Akron, Chemical Engineering.
Aluminum 2024-T3 and 7075-T6 are commonly used in aviation industry. The coating application on the aluminum surface is consider as one of the most effective method to ease the corrosion problem. Hex-chrome free coating which has less environmental issues was developed in recent years. In this work, we studied the degradation process of hex-chrome free coating/ aluminum system under the constant immersion environment with the help of a proposed damage evolution concept. This damage evolution concept includes four steps: 1. Initial water uptake process within coating layer, 2. Activation of electrochemical reaction in the coating and metal interface 3. Propagation of corrosion products below coating layer, coating delamination or degradation. 4. Coating totally fails, metal experiences severe metal loss. Three experimental variables were investigated in this project, they were: pH of electrolyte, top coat thickness, and metal effect. Impedance measurements of samples immersed in 3.5 wt% NaCl electrolyte were continually carried out for 160 days to study the impact of those experimental variables. A two dimensional transmission line model was developed in this work. This 2D-TLM was firstly verified via comparing the simulated EIS data with experimental results. A further application of this model gave us a local impedance distribution of hex-chrome free coating/aluminum profile. Via interpreting the local impedance distribution, a detailed degradation mechanism of sample in early immersion period was revealed.
Homero Castaneda-Lopez, Dr. (Advisor)
Scott Lillard, Dr. (Committee Member)
Hongbo Cong, Dr. (Committee Member)
85 p.
Chemical Engineering
EIS, Hex-Chrome free coating, Transmission Line Model

Recommended Citations

Citations

  • Niu, J. (2014). A Study on Damage Evolution Mechanism of Hex-Chrome Free Coating/Aluminum System and a Proposed 2D Transmission Line Model Based on Experimental Results [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1415641540

    APA Style (7th edition)

  • Niu, Jiani. A Study on Damage Evolution Mechanism of Hex-Chrome Free Coating/Aluminum System and a Proposed 2D Transmission Line Model Based on Experimental Results . 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1415641540.

    MLA Style (8th edition)

  • Niu, Jiani. "A Study on Damage Evolution Mechanism of Hex-Chrome Free Coating/Aluminum System and a Proposed 2D Transmission Line Model Based on Experimental Results ." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1415641540

    Chicago Manual of Style (17th edition)

akron1415641540
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This open access ETD is published by University of Akron and OhioLINK.