Failure Analysis of Paints and Coatings by Dwight G. Weldon

By Dwight G. Weldon

  • Entirely dedicated to the failure research of coatings and paints – an “excellent connection with a choose market”.
  • Latest version includes new fabric on floor training, move of salt to metal from infected abrasive, impact of top density on coating functionality, on galvanizing, silane-modified coatings, polyurea coatings, polyaspartics, and powder coatings and on dry spray.
  • Balances medical historical past and useful recommendation, giving either the idea and purposes in a slender, simply readable form.
  • Includes case reports of laboratory tests.
  • Written by way of an writer with over 25 years of expertise within the paint and coatings industry.

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This parameter can be calculated from the stress–strain curve by determining the slope of the line in the initial (Newtonian) phase of the testing. In addition to measuring the modulus, a stress–strain experiment also allows one to determine the tensile strength of a coating and its elongation at break. 2 A hypothetical stress–strain curve for ductile film. The tensile properties are defined as follows: E, tensile modulus; εY, elongation at yield; εB, elongation at break; σY, yield stress; σB, tensile strength.

The bending of the siding may result in the coating being extended past its yield point. 3 General kinds of stress–strain curves for various types of coatings: (a) brittle, (b) ductile, (c) elastomeric. The scales indicate order-of-magnitude values. From J. V. ), The New GARDNER–SWARD Handbook (Paint and Coatings Testing Manual), 14th Edn, 1995. Copyright American Society for Testing and Materials (ASTM). Reprinted with permission of the ASTM. the stress; there are no restoring forces acting at the steel–coating interface, and the coating therefore retains adhesion to the metal, with no cracking.

It may take a year or more to achieve the completely formed patina of fully weathered galvanized steel. This patina, due mostly to a very thin layer of zinc carbonate, results in a very stable and finely etched surface suitable for painting, and requires only power washing to remove loose debris (‘Duplex Systems: WHY COATINGS WORK AND WHY THEY FAIL 21 Painting Over Hot Dip Galvanized Steel’, American Galvanizers Association, 1998). Again, if fatty or oily contaminates are present, they should be removed as described above.

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