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Autodeposition coating process
| Details |
Inventors: Hall, Wilbur S.; Leister, Harry M.;
Assignee: Amchem Products, Inc. (Ambler, PA)
Primary Examiner: Smith; Ronald H.
Assistant Examiner: Bueker; Richard
Attorney, Agent or Firm: Barron; Alexis
In a process wherein an organic coating is formed on a metallic surface by immersing the surface in an acidic aqueous coating composition containing dispersed particles of an organic coating-forming material from which the particles are deposited on the metallic surface forming an organic coating which increases in thickness the longer the surface is immersed in the composition and wherein the temperature of the coating composition tends to rise with the result that the quality of coatings formed therefrom is affected adversely, particularly when coating worked or roughened metal surfaces, the improvement comprising maintaining the temperature of the coating composition at a temperature within the range over which the rate of change in the rate of film build is substantially constant thereby improving the quality of the coating formed by the deposition of coating-forming particles, including reducing or preventing the tendency of the composition to form coatings which contain pinholes and/or craters. |
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DETAILED DESCRIPTION OF THE INVENTION As will be seen from examples reported below, there are autodepositing applications in which defect-free coatings are produced.
However, under certain conditions, autodeposited coatings having defects are formed.
One of the factors involved in the formation of coatings having defects is the type of metal surface being treated.
Coating defects have been encountered when coating metal surfaces which have been worked, for example, subjected to forming, stamping, bending drawing, shearing or similar operations.
Working of the metal surface generally imparts strains or stresses to the metal and can result in scratching, scoring or galling of the surface.
The more highly worked the surface, the greater the tendency for coatings formed thereon to contain defects.
In general, the defects are confined to those portions of the coating that overlie the portions of the metal surface that have been worked.
For example, in an application in which but a portion of the metal surface has been galled as a result of a stamping operation, defects have been observed in only those portions of the coating that overlie the gall marks; otherwise, the coating is defect-free.
Defects in autodeposited coatings have also been encountered when coating metal surfaces that are in a roughened condition for reasons other than their having been worked.
Articles made by a casting operation often have roughened surfaces as a result of the rough surfaces of the walls of the mold in which the article is formed.
Defects in autodeposited coatings formed on metal surfaces of the type described above can take various forms, depending on the particular application involved.
For example, the defects may show up as pinholes and/or craters.
The exact cause of these defects is not fully understood though generally it is believed to be a deficiency in resin particles deposited in specific pinpoint areas on the worked or roughened metal surface resulting in a pinhole or crater in the cured coating
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