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The corrosion protection of 2219-t87 aluminum by organic and inorganic zinc-rich primers (Document No: 19950016769)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Danford, M. D. Mendrek, M. J. Walsh, D. W. |
| Copyright Year | 1995 |
| Description | The behavior of zinc-rich primer-coated 2219-T87 aluminum in a 3.5-percent Na-Cl was investigated using electrochemical techniques. The alternating current (ac) method of electro-chemical impedance spectroscopy (EIS), in the frequency range of 0.001 to 40,000 Hz, and the direct current (dc) method of polarization resistance (PR) were used to evaluate the characteristics of an organic, epoxy zinc-rich primer and an inorganic, ethyl silicate zinc-rich primer. A dc electrochemical galvanic corrosion test was also used to determine the corrosion current of each zinc-rich primer anode coupled to a 2219-T87 aluminum cathode. Duration of the EIS/PR and galvanic testing was 21 days and 24 h, respectively. the galvanic test results demonstrated a very high galvanic current between the aluminum cathode and both zinc-rich primer anodes (37.9 micro A/cm(exp 2) and 23.7 micro A/cm(exp 2) for the organic and inorganic primers, respectively). The PR results demonstrated a much higher corrosion rate of the zinc in the inorganic primer than in the organic primer, due primarily to the higher porosity in the former. Based on this investigation, the inorganic zinc-rich primer appears to provide superior galvanic protection and is recommended for additional study for application in the solid rocket booster aft skirt. |
| File Size | 649664 |
| Page Count | 22 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950016769 |
| Archival Resource Key | ark:/13960/t3324vv66 |
| Language | English |
| Publisher Date | 1995-02-01 |
| Access Restriction | Open |
| Subject Keyword | Metallic Materials Electrochemical Corrosion Aluminum Solid Propellant Rocket Engines Spectroscopic Analysis Zinc Space Shuttle Boosters Metal Coatings Corrosion Prevention Direct Current Corrosion Tests Porosity Protective Coatings Alternating Current Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
