TEST METHODS FOR MAGNESIUM SURFACE TREATMENTS. Period Covered: February 1, 1955 to July 1, 1956
Abstract
A study was made of test methods whereby the quality of Mg sunface treatments could be determined. Methods which measured the corrosion-inhibiting powcr of the coating were found unsatisfactory. A method based on measurement of paint adherence after exposure to a corrosive environment was found quite promising. The latter approach evolved the Gauze-Peel Test,'' in which a gauze strip is embedded in the orgainic coating. After exposure to accelerated corrosion, the gauze is peeled from the surface. Both quantitativc (peel strength) and qualitative (visual examination of the stripped area) evaluations are easily made. An important observation made during preparation of experimental specimens was that contact between Mg and steel during Dow 7 treatment leads to rapidly deteriorating painted surfaces. (auth)
- Authors:
- Publication Date:
- Research Org.:
- Illinois Inst. of Tech., Chicago. Armour Research Foundation
- OSTI Identifier:
- 4308440
- Report Number(s):
- WADC-TR-57-195; AD-142146
- NSA Number:
- NSA-12-005967
- DOE Contract Number:
- AF33(616)-2855
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: Project title: FINISHES AND MATERIALS PRESERVATION. Task title: ELECTRODEPOSITION AND ELECTROCHEMICAL TREATMENTS. Orig. Receipt Date: 31-DEC-58
- Country of Publication:
- United States
- Language:
- English
- Subject:
- MINERALOGY, METALLURGY, AND CERAMICS; COATING; CORROSION; MAGNESIUM; MATERIALS TESTING; MEASURED VALUES; PIGMENTS; STEELS; SURFACES
Citation Formats
Pfohl, F.W., and Francis, H.T. TEST METHODS FOR MAGNESIUM SURFACE TREATMENTS. Period Covered: February 1, 1955 to July 1, 1956. United States: N. p., 1957.
Web.
Pfohl, F.W., & Francis, H.T. TEST METHODS FOR MAGNESIUM SURFACE TREATMENTS. Period Covered: February 1, 1955 to July 1, 1956. United States.
Pfohl, F.W., and Francis, H.T. Fri .
"TEST METHODS FOR MAGNESIUM SURFACE TREATMENTS. Period Covered: February 1, 1955 to July 1, 1956". United States.
doi:.
@article{osti_4308440,
title = {TEST METHODS FOR MAGNESIUM SURFACE TREATMENTS. Period Covered: February 1, 1955 to July 1, 1956},
author = {Pfohl, F.W. and Francis, H.T.},
abstractNote = {A study was made of test methods whereby the quality of Mg sunface treatments could be determined. Methods which measured the corrosion-inhibiting powcr of the coating were found unsatisfactory. A method based on measurement of paint adherence after exposure to a corrosive environment was found quite promising. The latter approach evolved the Gauze-Peel Test,'' in which a gauze strip is embedded in the orgainic coating. After exposure to accelerated corrosion, the gauze is peeled from the surface. Both quantitativc (peel strength) and qualitative (visual examination of the stripped area) evaluations are easily made. An important observation made during preparation of experimental specimens was that contact between Mg and steel during Dow 7 treatment leads to rapidly deteriorating painted surfaces. (auth)},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Aug 23 00:00:00 EDT 1957},
month = {Fri Aug 23 00:00:00 EDT 1957}
}
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Features mentioned as well established are: Corrosion of Mg, except in a dry atmosphere, is galvanic in nature; the purest Mg has the lowest corrosion rate; the effect of impurities is characterized by a critical concentration, the tolerance limit, below which there is little influence of the impurity; the naturally formed films are stable only under special, and very often limited conditions and are therefore not generally protective. However, under reasonable inland atmospheric conditions, and even in fresh water, the corrosion resistance of Mg and some of its alloys is quite satisfactory. Many artificial coatings have been developed that givemore »
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DEVELOPMENT OF A CORROSION RESISTANT MAGNESIUM ALLOYS. PART II. SURFACE TENSION DATA OF ELEMENTS. Period covered May 1955 to September 1956
Experimental and estimated values of surface tension of 75 elements have been gathered. This unique collection was of value in elucidating the Mg alloying program and should be of use to workers in other fields. Correlations for estimating surface tension values of elements have been scrutinized, augmented, and used. An extensive bibliography on the subject of surface tension is presented. (auth)