1、 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. AUGUST 2009 Page 1 of 4 NAVISTAR, INC. CEMS (CORPORATE ENGINEERING MATERIAL SPECI
2、FICATION) NUMBER: CEMS GT-5A TITLE: Adhesion Of Paint CURRENT ISSUE DATE: August 2009 WRITTEN/REVIEWED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES ISSUE OF: August 2001 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This specification may involve ha
3、zardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to determine the applicability of regulatory limits prior to use. Change Notic
4、e: Replaced “International Truck and Engine Corporation” with “Navistar, Inc.” per corporate directive. 1.0 SCOPE This is a method for determining the ability of a dry film paint to adhere to a subjacent surface or to a subjacent dry film of paint or primer. 2.0 APPLICATION This test method may be u
5、sed in the field, on job sites, or in the laboratory. When used in the field or on job sites the specimen to be tested is the coated part or article on which the adhesion is to be evaluated. When used in the laboratory the specimens generally consist of specially prepared test panels. 3.0 PREPARATIO
6、N - FIELD TEST The surface to be tested should be clean and dry and the test should be performed only on fully cured paint films in which the paint film and substrate have been allowed to cool to room temperature, 15-35C (55-90F). Extremes in temperature or relative humidity may affect the adhesion
7、of the tape or the coating. 4.0 PREPARATION - LABORATORY TEST 4.1 Apparatus Recirculating oven capable of maintaining a temperature of 49 + 3C (120 + 5F) 4.2 Material 4.2.1 Bonderite CD-10 or BONDERITE 958 zinc phosphated steel panels, 100 x 150 mm (4 x 6 in.), available from Advanced Coatings Techn
8、ologies, 273 Industrial Drive, Hillsdale, Michigan 49242. OR Fiber glass reinforced plastic panels available from Materials Engineering, International Truck and Engine Corporation, P. O. Box 1109, Ft. Wayne, Indiana 46801-1109. 4.2.2 Razor blade. 4.2.3 Cutting guide or metal straight edge. 4.2.4 Tra
9、nsparent cellophane tape PERMACEL #99, or 3M 610 available from GARDNER LABORATORIES or from local 3M distributors. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: CEMS GT
10、-5A TITLE: Adhesion Of Paint CURRENT ISSUE DATE: August 2009 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. AUGUST 2009 Page 2 of
11、 4 4.3 Prepare the appropriate quantity and type of panels for the grade of paint being tested according to the procedure specified in Test Method GT-13, Panel Preparation. For Grades -50, -50T, -52, -52W and -53, proceed up to but not including the step in which the primed and dried panels are sand
12、ed. 4.3.1 Two steel panels - Grades -17, -17HS, -18, -19, -19HS, -29, -29HS, -29T, -29THS, -32, -32HS, -32HS/Ur, -50, -54, -55, -55W, -62 -81HS, -81W, -82W, AND -83W. 4.3.2 Four steel panels - Grades -33, -53, and -53A. 4.3.3 Four FRP panels - Grades -52, -52HS, and -52W. For grades where four panel
13、s are prepared (except Grades -52 and -52HS), two alternative drying procedures, an air dry and an oven dry, are specified. For these grades, two panels will be dried according to the air drying procedure and the remaining two panels will be dried according to the oven drying procedure. For grades w
14、here two panels are prepared, only one drying procedure is specified; for these grades, both panels will be dried according to this procedure. For Grades -52 and -52HS, four panels are prepared, two with a sanded substrate and two with an unsanded substrate, for each alternate drying procedure. 4.4
15、Age the prepared panels for 72 hours in a recirculating oven at 49 + 3C (120 + 5F), remove and cool to 21 to 27C (70 to 80F). 5.0 PROCEDURE 5.1 On each part or panel select an area free of blemishes and minor surface imperfections and crosshatch an area of approximately 400 mm2 (0.75 square in.) by
16、cutting through the paint film with a new razor blade making parallel and perpendicular cuts/incisions as follows: 5.1.1 For coatings having a dry film thickness less than 50m (2.0 mils) space the cuts 1 mm (0.040 in.) apart and make eleven (11) cuts 5.1.2 For coatings having a dry film thickness of
17、 50 m (2.0 mils)or greater space the cuts 2 mm (0.080 in.) apart and make six (6) cuts. 5.1.3 Make all cuts approximately 20 mm (0.75 in.) long. Cut through the paint film to the substrate in one steady motion using sufficient pressure on the cutting tool to insure the cutting edge penetrates to the
18、 substrate. When making single cuts with the aid of a straight edge place the guide on the uncut area of the paint film. 5.1.4 After making the required number of cuts brush the film lightly with a soft brush or tissue to remove any paint flakes or ribbons of coating. 5.1.5 Examine the cutting edge
19、to insure sharpness and replace as necessary. Make the additional cuts at 90 (perpendicular) to and centered on the original cuts. 5.1.6 Brush/clean the area as before and examine the incisions to insure the cuts have penetrated to the substrate. If the substrate has not been reached make a new grid
20、 pattern in another location. Do not attempt to deepen a previous cut as this may affect the adhesion along the incision. 5.2 Remove two complete laps of tape and discard. Remove an additional piece of tape and cut a length approximately 75 mm (3 in.) long. 5.3 Press the tape firmly onto the crossha
21、tched area and rub the tape to ensure good contact and removal of air bubbles. 5.4 Within 90 30 sec of application of the tape remove the tape with a sharp upward motion in a direction 90 to the surface. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for Re
22、saleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: CEMS GT-5A TITLE: Adhesion Of Paint CURRENT ISSUE DATE: August 2009 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers a
23、re required to assume all patent liability. 2009 by Navistar, Inc. AUGUST 2009 Page 3 of 4 5.5 Inspect the grid area for removal of coating from the substrate or between coatings. Rate the adhesion on a scale of 5B to 0B in accordance with the classification chart shown in Figure 1, page 4. 6.0 REPO
24、RT 6.1 Report the number of tests run, their mean and range, and the lowest rated value of all panels/parts tested. 6.2 Report the location of failed adhesion i.e. between the substrate and phosphate, phosphate to primer, primer to topcoat, etc. 6.3 Report the substrate used, the type of coating, an
25、d method of cure. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: CEMS GT-5A TITLE: Adhesion Of Paint CURRENT ISSUE DATE: August 2009 This document is restricted and may n
26、ot be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. AUGUST 2009 Page 4 of 4 Classification Surface of Cross-Cut Area from which flaking has occurred. (Example for 6 parall
27、el Cuts) 5B (100%) NONE 4B (95%) 3B (90%) 2B (65-89%) 1B 0B Greater than 65% Note: When the Product Specification describes the adhesion requirement as 90% minimum: the classification shall not be less than 3B as shown above. 5B The edges of the cuts are completely smooth; none of the coating is det
28、ached from the lattice. 4B - Small flakes of coating are detached at intersections; less than 5% of the coating is detached. 3B - Small flakes of coating are detached at the edges of cuts and at intersections; the area affected is 5 - 10% of the lattice. 2B - The coating has flaked along edges and o
29、n parts of the squares; the area affected is 10 - 35% of the lattice. 1B - The coating has flaked in ribbons along edges and whole squares have detached; the area affected is 35 65% of the lattice. 0B - Flaking and detachment worse than 1B. Copyright Navistar International Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
