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  • 1
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    The corrosion protection of 2219-T87 aluminum by anodizing (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Various types of anodizing coatings were studied for 2219-T87 aluminum. These include both type II and type III anodized coats which were water sealed and a newly developed and proprietary Magnaplate HCR (TM) coat. Results indicate that type II anodizing is not much superior to type II anodizing as far as corrosion protection for 2219-T87 aluminum is concerned. Magnaplate HCR (TM) coatings should provide superior corrosion protection over an extended period of time using a coating thickness of 51 microns (2.0 mils).
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-103540 , NAS 1.15:103540
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Equivalent circuit models for ac impedance data analysis (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A least-squares fitting routine has been developed for the analysis of ac impedance data. It has been determined that the checking of the derived equations for a particular circuit with a commercially available electronics circuit program is essential. As a result of the investigation described, three equivalent circuit models were selected for use in the analysis of ac impedance data.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-TM-100402 , NAS 1.15:100402
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    NASA TECHNICAL REPORTS
  • 3
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    The corrosion protection of several aluminum alloys by chromic acid and sulfuric acid anodizing (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The corrosion protection afforded 7075-T6, 7075-T3, 6061-T6, and 2024-T3 aluminum alloys by chromic acid and sulfuric acid anodizing was examined using electrochemical techniques. From these studies, it is concluded that sulfuric acid anodizing provides superior corrosion protection compared to chromic acid anodizing.
    Keywords: METALLIC MATERIALS
    Type: NASA-TP-3490 , M-753 , NAS 1.60:3490
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    NASA TECHNICAL REPORTS
  • 4
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    The role of grain boundaries in hydrogen diffusion in metals at 25 C (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The effect of grain size on hydrogen diffusion at 25 C was examined for 4340 steel (body-centered cubic) and for Inconel 718 (face-centered cubic). It was found that the effect of grain size is important for body-centered cubic structures, but plays a much less important role in face centered cubic structures. Accurate measurements of hydrogen desorption coefficients during hydrogen desorption show that these are not greatly different for both types of structures.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-108407 , NAS 1.15:108407
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  • 5
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    A comparison of chromic acid and sulfuric acid anodizing (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Because of federal and state mandates restricting the use of hexavalent chromium, it was deemed worthwhile to compare the corrosion protection afforded 2219-T87 aluminum alloy by both Type I chromic acid and Type II sulfuric acid anodizing per MIL-A-8625. Corrosion measurements were made on large, flat 2219-T87 aluminum alloy sheet material with an area of 1 cm(exp 2) exposed to a corrosive medium of 3.5-percent sodium chloride at pH 5.5. Both ac electrochemical impedance spectroscopy and the dc polarization resistance techniques were employed. The results clearly indicate that the corrosion protection obtained by Type II sulfuric acid anodizing is superior, and no problems should result by substituting Type II sulfuric acid anodizing for Type I chromic acid anodizing.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-108383 , NAS 1.15:108383
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  • 6
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    The effect of tensile stress on hydrogen diffusion in metal alloys (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The effect of tensile stress on hydrogen diffusion has been determined for Type 303 stainless steel, A286 CRES, and Waspaloy and IN100 nickel-base alloys. It was found that hydrogen diffusion coefficients are not significantly affected by stress, while the hydrogen permeabilities are greatly affected in Type 303 stainless steel and A286 CRES (iron-based alloys), but are affected little in Waspaloy (nickel-base) and not affected in all in IN100 (nickel base). These observations might be taken as an indication that hydrogen permeabilities are affected by stress in iron-based alloys, but only slightly affected in nickel-based alloys. However, it is too early to make such a generalization based on the study of only these four alloys.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-108386 , NAS 1.15:108386
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  • 7
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    The Corrosion Protection of Metals by Ion Vapor Deposited Aluminum (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A study of the corrosion protection of substrate metals by ion vapor deposited aluminum (IVD Al) coats has been carried out. Corrosion protection by both anodized and unanodized IVD Al coats has been investigated. Base metals included in the study were 2219-T87 Al, 7075-T6 Al, Titanium-6 Al-4 Vanadium (Ti-6Al-4V), 4130 steel, D6AC steel, and 4340 steel. Results reveal that the anodized IVD Al coats provide excellent corrosion protection, but good protection is also achieved by IVD Al coats that have not been anodized.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-108425 , NAS 1.15:108425
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  • 8
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    The interaction of hydrogen with metal alloys (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Hydrogen diffusion coefficients were measured for several alloys, and these were determined to be about the same at 25 C for all alloys investigated. The relation of structure, both metallurgical and crystallographic, to the observed hydrogen distribution on charging was investigated, as well as the role of hydride formation in the hydrogen resistance of metal alloys. An attempt was made to correlate the structures and compositions of metal alloys as well as other parameters with the ratios of their notched tensile strengths in hydrogen to that in helium, R(H2/He), which are believed to represent a measure of their hydrogen resistance. Evidence supports the belief that hydrogen permeability and hydrogen resistance are increased by smaller grain sizes for a given alloy composition.
    Keywords: METALLIC MATERIALS
    Type: NASA-TP-3128 , M-664 , NAS 1.60:3128
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    NASA TECHNICAL REPORTS
  • 9
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    The temperature variation of hydrogen diffusion coefficients in metal alloys (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Hydrogen diffusion coefficients were measured as a function of temperature for a few metal alloys using an electrochemical evolution technique. Results from these measurements are compared to those obtained by the time-lag method. In all cases, diffusion coefficients obtained by the electrochemical method are larger than those by the time-lag method by an order of magnitude or more. These differences are attributed mainly to hydrogen trapping.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-TM-100397 , NAS 1.15:100397
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  • 10
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    The corrosion protection of 6061-T6 aluminum by a polyurethane-sealed anodized coat (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The corrosion protection of 6061-T6 anodized aluminum afforded by a newly patented polyurethane seal was studied using the ac impedance technique. Values of the average corrosion rates over a 27-day exposure period in 3.5 percent NaCl solutions at pH 5.2 and pH 9.5 compared very favorably for Lockheed-prepared polyurethane-sealed and dichromate-sealed coats of the same thickness. Average corrosion rates for both specimens over the first 7 days of exposure compared well with those for a hard anodized, dichromate-sealed coat, but rose well above those for the hard anodized coat over the entire 27-day period. This is attributed both to the greater thickness of the hard anodized coat, and possibly to its inherently better corrosion protective capability.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-100394 , NAS 1.15:100394
    Format: application/pdf
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