A comparison of chromic acid and sulfuric acid anodizing
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A comparison of chromic acid and sulfuric acid anodizing

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Published by National Aeronautics and Space Administration, George C. Marshall Space Flight Center, For sale by the National Technical Information Service in [Marshall Space Flight Center, Ala.], [Springfield, Va .
Written in English

Subjects:

  • Metals -- Anodic oxidation.,
  • Sulfuric acid.

Book details:

Edition Notes

Statementby M.D. Danford.
SeriesNASA TM -- 108383., NASA technical memorandum -- 108303.
ContributionsGeorge C. Marshall Space Flight Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL14685899M

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A COMPARISON OF CHROMIC ACID AND SULFURIC ACID ANODIZING INTRODUCTION Due to the severe restrictions being placed on the use of hexavalent chromium (a prime com-ponent of chromic acid anodizing) by federal and state mandates, it was deemed worthwhile to investi-. A Comparison of Thin Film Sulfuric Acid Anodizing and Chromic Acid Anodizing Processes Article (PDF Available) April with Reads How we measure 'reads'. Because of federal and state mandates restricting the use of hexavalent chromium, it was deemed worthwhile to compare the corrosion protection afforded T87 aluminum alloy by both Type I chromic acid and Type II sulfuric acid anodizing per MIL-A Corrosion measurements were made on large, flat T87 aluminum alloy sheet material with an area of 1 cm(exp 2) exposed to a . sulfuric/boric acid anodizing in comparison to chromic acid anodizing, both sealed and unsealed on various substrates. These films were examined as pretreatments for standard Navy coatings using the procedures described below. Also, the fatigue characteristics of the SBAA and CAA oxides wpre characterized to determine any detrimental effects.

Full text of "DTIC ADA A Comparison of Thin Film Sulfuric Acid Anodizing and Chromic Acid Anodizing other formats REPORT NO. NAWCADWAR A COMPARISON OF THIN FILM SULFURIC ACID ANODIZING AND CHROMIC ACID ANODIZING PROCESSES By Stephen M. Cohen* and Stephen J. Spadafora Aerospace Materials Division Air Vehicle Technology . Chromic acid anodizing is very thin, and cannot be colored. Its use is usually limited to parts where materials are mated or have tight hems, and bleed-out of entrapped chemistry will tend to self heal. Sulfuric anodize is your every day anodize. Good cosmetics and corrosion resistance are obtained. Parts can be dyed a variety of colors. lyte is chromic acid; sulfuric processes, in which the electrolyte is sulfuric acid; and hard anodic processes that use sulfuric acid alone or with additives. Other processes, used less frequently Service Size Finishing before Anodizing requirements Product mm in. Alloy anodizing process Post-treatment or . What is Sulfuric Acid Anodize / MIL-A Type II? The sulfuric acid process is the most common method for anodizing. The sulfuric acid anodize process films range from"" thick. The overall thickness of the coating formed is 67 percent penetration in the substrate and 33 percent growth over the original dimension of the part.

DTIC ADA A Comparison of Thin Film Sulfuric Acid Anodizing and Chromic Acid Anodizing Processes. by Defense Technical Information Center. Sulfuric Acid Anodize (SAA) is utilized as a replacement for Chromic Acid Anodize as well, and are also utilized for corrosion protection, paint adhesion and fatigue reduction. It is used for dying of product for identification in the aerospace industry and for decorative . Chromic Acid is a naturally occurring oxide with a formula H 2 CrO 4. Chromic Acid is also called Tetraoxochromic acid or Chromic(VI) acid. It is usually a mixture made by adding concentrated sulfuric acid (H 2 SO 4) to a dichromate which consists of a variety of compounds and solid chromium trioxide. What is Chromic Acid Anodize? Chromic acid anodizing or type I anodize results in the thinnest anodic coat of the principal three types; typically on the order of”” (20 to microinches) per surface. While thin, when properly sealed chromic anodize affords the aluminum equal corrosion protection to the thicker sulfuric and hardcoat type anodize.