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  • 1
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    Electrochemical Impedance Spectroscopy of Conductive Polymer Coatings (1996)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Electrochemical impedance spectroscopy (EIS) was used to investigate the corrosion protection performance of twenty nine proprietary conductive polymer coatings for cold rolled steel under immersion in 3.55 percent NaCl. Corrosion potential as well as Bode plots of the data were obtained for each coating after one hour immersion, All coatings, with the exception of one, have a corrosion potential that is higher in the positive direction than the corrosion potential of bare steel under the same conditions. Group A consisted of twenty one coatings with Bode plots indicative of the capacitive behavior characteristic of barrier coatings. An equivalent circuit consisting of a capacitor in series with a resistor simulated the experimental EIS data for these coatings very well. Group B consisted of eight coatings that exhibited EIS spectra showing an inflection point which indicates that two time constants are present. This may be caused by an electrochemical process taking place which could be indicitive of coating failing. These coatings have a lower impedance that those in Group A.
    Keywords: Nonmetallic Materials
    Type: NASA/ASEE Summer Faculty Fellowship Program; 21-30; NASA-CR-202756
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Evaluation of candidate alloys for the construction of metal flex hoses in the STS launch environment (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Various vacuum jacketed cryogenic supply lines at the Shuttle launch site use convoluted flexible expansion joints. The atmosphere at the launch site has a very high salt content, and during a launch fuel combustion products include hydrochloric acid. This extremely corrosive environment has caused pitting corrosion failure in the flex hoses, which were made out of 304L stainless steel. A search was done to find a more corrosion resistant replacement material. Nineteen metal alloys were tested. Tests which were performed include electrochemical corrosion testing, accelerated corrosion testing in a salt fog chamber, long term exposure at the beach corrosion testing site, and pitting corrosion tests in ferric chloride solution. Based on the results, the most corrosion resistant alloys were found to be, in order, Hastelloy C-22, Inconel 625, Hastelloy C-276, Hastelloy C-4, and Inco Alloy G-3. Of these top five alloys, the Hastelloy C-22 stands out as being the best of the alloys tested.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-103808 , MTB-325-87A , NAS 1.15:103808
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Tests Of Protective Coats For Carbon Steel (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Report describes laboratory and field tests of candidate paints (primers, tie coats, and topcoats) for use in protecting carbon-steel structures against corrosion in seaside environment at Kennedy Space Center. Coating materials selected because of utility in preventing corrosion, also on basis of legal requirements, imposed in several urban areas, for reduction of volatile organic contents.
    Keywords: MATERIALS
    Type: KSC-11656 , NASA Tech Briefs (ISSN 0145-319X); 19; 7; P. 76
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Tests Of Materials For Repair Coating Of Carbon Steel (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Report describes tests of paints (primers and topcoats) for use in recoating rusted carbon steel for protection against further corrosion. Paints selected for evaluation all designated by manufacturers as suitable for application over tightly adhering rust.
    Keywords: MATERIALS
    Type: KSC-11635 , NASA Tech Briefs (ISSN 0145-319X); 19; 5; P. 99
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The Effects of Chemical Wash Additives on the Corrosion of Aerospace Alloys in Marine Environments (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper presents the methodology for comparing the relative effectiveness of four chemical products used for rinsing airplanes and helicopters. The products were applied on a weekly basis to a series of flat alloy panels exposed to an oceanfront marine environment for one year. The results are presented along with comparisons of exposures of the same alloys that were not washed, were washed with seawater, or washed with de-ionized water.
    Keywords: Metals and Metallic Materials
    Type: KSC-2002-005 , Tri-Service Conference; Jan 14, 2002 - Jan 18, 2002; San Antonio, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Galvanic Liquid Applied Coatings for the Protection of Rebar in Concrete (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Metals and Metallic Materials
    Type: KSC-2004-005 , U.S. Army Summit; Feb 12, 2004; Cocoa Beach, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Galvanic Liquid Applied Coating Development for Protection of Steel in Concrete (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Corrosion of reinforcing steel in concrete is a major problem affecting NASA facilities at Kennedy Space Center (KSC), other government agencies, and the general public. Problems include damage to KSC launch support structures, transportation and marine infrastructures, as well as building structures. A galvanic liquid applied coating was developed at KSC in order to address this problem. The coating is a non-epoxy metal rich ethyl silicate liquid coating. The coating is applied as a liquid from initial stage to final stage. Preliminary data shows that this coating system exceeds the NACE 100 millivolt shift criterion. The remainder of the paper details the development of the coating system through the following phases: Phase I: Development of multiple formulations of the coating to achieve easy application characteristics, predictable galvanic activity, long-term protection, and minimum environmental impact. Phase II: Improvement of the formulations tested in Phase I including optimization of metallic loading as well as incorporation of humectants for continuous activation. Phase III: Application and testing of improved formulations on the test blocks. Phase IV: Incorporation of the final formulation upgrades onto large instrumented structures (slabs).
    Keywords: Metals and Metallic Materials
    Type: KSC-2004-028 , Corrosion 2004 Conference and Expo 2004; Mar 28, 2004 - Apr 01, 2004; New Orleans, LA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Anti-Corrosive Powder Particles (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The National Aeronautics and Space Administration (NASA) seeks partners for a new approach in protecting embedded steel surfaces from corrosion. Corrosion of reinforced steel in concrete structures is a significant problem for NASA structures at Kennedy Space Center (KSC) because of the close proximity of the structures to salt spray from the nearby Atlantic Ocean. In an effort to minimize the damage to such structures, coatings were developed that could be applied as liquids to the external surfaces of a substrate in which the metal structures were embedded. The Metallic Pigment Powder Particle technology was developed by NASA at KSC. This technology combines the metallic materials into a uniform particle. The resultant powder can be sprayed simultaneously with a liquid binder onto the surface of concrete structures with a uniform distribution of the metallic pigment for optimum cathodic protection of the underlying steel in the concrete. Metallic Pigment Powder Particle technology improves upon the performance of an earlier NASA technology Liquid Galvanic Coating (U.S. Patent No. 6,627,065).
    Keywords: Metals and Metallic Materials
    Type: KSC-12631 , KSC-2005-131
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Molybdate Coatings for Protecting Aluminum Against Corrosion (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Conversion coatings that comprise mixtures of molybdates and several additives have been subjected to a variety of tests to evaluate their effectiveness in protecting aluminum and alloys of aluminum against corrosion. Molybdate conversion coatings are under consideration as replacements for chromate conversion coatings, which have been used for more than 70 years. The chromate coatings are highly effective in protecting aluminum and its alloys against corrosion but are also toxic and carcinogenic. Hexavalent molybdenum and, hence, molybdates containing hexavalent molybdenum, have received attention recently as replacements for chromates because molybdates mimic chromates in a variety of applications but exhibit significantly lower toxicity. The tests were performed on six proprietary formulations of molybdate conversion coatings, denoted formulations A through F, on panels of aluminum alloy 2024-T3. A bare alloy panel was also included in the tests. The tests included electrochemical impedance spectroscopy (EIS), measurements of corrosion potentials, scanning electron microscopy (SEM) with energy-dispersive spectroscopy (EDS), and x-ray photoelectron spectroscopy (XPS).
    Keywords: Man/System Technology and Life Support
    Type: KSC-12346 , NASA Tech Briefs, January 2005; 17
    Format: application/pdf
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  • 10
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    Liquid Coatings for Reducing Corrosion of Steel in Concrete (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Inorganic coating materials are being developed to slow or stop corrosion of reinforcing steel members inside concrete structures. It is much simpler and easier to use these coating materials than it is to use conventional corrosion-inhibiting systems based on impressed electric currents. Unlike impressed electrical corrosion-inhibiting systems, these coatings do not require continuous consumption of electrical power and maintenance of power-supply equipment. Whereas some conventional systems involve the use of expensive arc-spray equipment to apply the metallic zinc used as the sacrificial anode material, the developmental coatings can be applied by use of ordinary paint sprayers. A coating material of the type under development is formulated as a liquid containing blended metallic particles and/or moisture-attracting compounds. The liquid mixture is sprayed onto a concrete structure. Experiments have shown that even though such a coat resides on the exterior surface, it generates a protective galvanic current that flows to the interior reinforcing steel members. By effectively transferring the corrosion process from the steel reinforcement to the exterior coating, the protective current slows or stops corrosion of the embedded steel. Specific formulations have been found to meet depolarization criteria of the National Association of Corrosion Engineers (NACE) for complete protection of steel reinforcing bars ("rebar") embedded in concrete.
    Keywords: Man/System Technology and Life Support
    Type: KSC-12049 , NASA Tech Briefs, December 2003; 6-7
    Format: application/pdf
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