NDLI: The corrosion mechanisms for primer coated 2219-t87 aluminum

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The corrosion mechanisms for primer coated 2219-t87 aluminum

Content Provider	NASA Technical Reports Server (NTRS)
Author	Danford, Merlin D. Knockemus, Ward W.
Copyright Year	1987
Description	To investigate metal surface corrosion and the breakdown of metal protective coatings, the ac Impedance Method was applied to zinc chromate primer coated 2219-T87 aluminum. The EG&GPARC Model 368 ac Impedance Measurement System, along with dc measurements with the same system using the Polarization Resistance Method, was used to monitor changing properties of coated aluminum disks immersed in 3.5 percent NaCl solutions buffered at pH 5.5 and pH 8.2 over periods of 40 days each. The corrosion system can be represented by an electronic analog called an equivalent circuit consisting of resistors and capacitors in specific arrangements. This equivalent circuit parallels the impedance behavior of the corrosion system during a frequency scan. Values for resistances and capacitances, that can be assigned in the equivalent circuit following a least squares analysis of the data, describe changes occurring on the corroding metal surface and in the protective coatings. A suitable equivalent circuit has been determined which predicts the correct Bode phase and magnitude for the experimental sample. The dc corrosion current density data are related to equivalent circuit element parameters.
File Size	1007160
Page Count	26
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870011643
Archival Resource Key	ark:/13960/t5p895k83
Language	English
Publisher Date	1987-04-01
Access Restriction	Open
Subject Keyword	Metallic Materials Analogs Corrosion Resistance Electronic Equipment Polarization Characteristics Primers Coatings Electrochemistry Aluminum Alloys Impedance Protective Coatings Equivalent Circuits 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

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