ADHESION FUNDAMENTALS AND METHODS OF TESTING ORGANIC COATINGS

CHEMICAL AND PHYSICAL FORCES RESPONSIBLE FOR ADHESION OF COATINGS TO VARIOUS SUBSTRATES, INCLUDING OTHER COATINGS, ARE DISCUSSED. GOOD ADHESION IS CONCEDED TO BE ESSENTIAL FOR GOOD PERFORMANCE OF A COATING IN MOST INDUSTRIAL APPLICATIONS, EXCEPT STRIPPABLE COATINGS. A GOOD COATING SYSTEM INVOLVES: (1) PREPARING THE SURFACE PROPERLY, (2) SELECTING A COATING WITH PROPERTIES PERMITTING IT TO ADHERE TO THE PREPARED SURFACE OF THE SUBSTRATE MATERIALS SO THEIR BEST ADHESIVE PROPERTIES ARE REALIZED, AND (4) APPLYING THE COATING SO THAT IT CAN ACHIEVE GOOD ADHESION. SURFACE PREPARATION METHODS ARE DESCRIBED TO IMPROVE ADHESION BETWEEN METALS TO COATINGS AND COATINGS TO COATINGS. PRIMERS ARE DESCRIBED WHICH ARE USED TO GET GOOD ADHESION BETWEEN A TOP COAT AND A METAL. OTHER FACTORS NEEDED TO OBTAIN GOOD ADHESION ARE DISCUSSED: (1) PIGMENTS AIDING ADHESION, (2) SOLVENTS, (3) CURING PROCEDURES, AND (4) INHERENT PROPERTIES. THE FOLLOWING REASONS ARE DISCUSSED FOR POOR ADHESION: (1) POOR SURFACE PREPARATION, (2) CONTAMINATION, (3) POOR APPLICATION TECHNIQUES, (4) POOR FORMULATION, 75) INCOMPATIBILITY, AND (6) ENDOSMOSIS AND ELECTROENDOMOSIS. THE FOLLOWING TEST EQUIPMENT USED TO MEASURE ADHESIONS ARE DESCRIBED: (1) PEEL TESTS, (2) MODIFIED PEEL TEST, (3) THE NACE X KNIFE ADHESION TEST, (4) ASTM D2197-68, TENTATIVE METHODS OF TEST FOR ADHESION OF ORGANIC COATINGS, (5) SCRAPE ADHESION TEST, (6) PARALLEL GROOVE TESTS, (7) SCRATCH TEST, (8) HESIOMETER, (9) PARALLEL SCRATCH TESTS, (10) WHIRLING BALL TESTS, (11) DISPENSIBILITY TESTS, (12) TWISTING CORK TEST, AND (13) ADHESIVE TAPE TEST. ADHESION TESTS APPEAR TO BE ESSENTIALLY SUBJECTIVE. AN ABSOLUTE CRITERION IS LACKING AGAINST WHICH A TEST MAY BE COMPARED.

• Supplemental Notes:
  • Vol 9, No 5, PP 31-36, 5 FIG, 3 TAB, 27 REF
• Authors:
  • Hamner, N
• Publication Date: 1970-5

Media Info

• Serial:
  • Materials Protection
  • Publisher: National Association of Corrosion Engineers

Subject/Index Terms

• TRT Terms: Adhesion; Organic coatings; Pigments; Primers; Test procedures; Testing equipment
• Uncontrolled Terms: Preparation
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216980
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 29 1970 12:00AM