1、 FORD LABORATORY TEST METHODBI 123-01Date Action Revisions 2005 03 22 Revised Automatic/Manual test procedure changes, revised procedure and evaluation M. Kelly 2001 03 20 Revised Editorial no technical change A. Cockman 1996 10 02 Printed copies are uncontrolled Copyright 2005, Ford Global Technolo
2、gies, LLC Page 1 of 8 PAINTED SHEET METAL CORROSION TEST (Laboratory-Simulated Arizona Proving Ground Test) Application This test procedure is used to evaluate the relative corrosion performance of paint coating systems applied to test panels and to car body sheet metal parts. It is designed to simu
3、late the corrosive conditions of the Arizona Proving Ground (APG) Vehicle Accelerated Corrosion Test (CETP 00.00-R-311). Apparatus Required Automatic Method: Humidity Cabinet Thermotron Industries Autotechnology Company 291 Hollen Park Drive 20026 Progress Drive Holland, MI 49423 Strongsville, OH 44
4、149 (616) 392-1491 (440) 572-7800 Automated Cyclic Corrosion Test Chamber, model ACT-30-CHM-1(Thermotron) or NC series test chambers (Autotechnology Co.), or equivalent, with forced air circulation, temperature control of +/- 2 C to 65 C and relative humidity control of +/- 2% up to 90%. Manual Meth
5、od: Humidity Cabinet Thermotron Industries 291 Hollen Park Drive Holland, MI 49423 (616) 392-1491 Model No. SE-600, or equivalent with forced air circulation, temperature control of +/- 2 C to 65 C and relative humidity control of +/- 2% up to 90%. Tank Polyethylene or plastic-lined tank, with cover
6、, of sufficient size and capacity to permit the test samples to be immersed in the salt solution. For 100 x 300 mm test panels a 42 L Nalgene polyethylene tank (VWR Catalog No. 60463 - 040) is adequate. Brush Camel hair brush, flat style (VWR Catalog No. 17215-067, or equivalent). Materials Required
7、 Tape 20 mm wide, 3 M No. 898 Test Tape, or equivalent. FORD LABORATORY TEST METHODBI 123-01Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 2 of 8 Scribing Tools Straight shank lathe cutting tool bit, 8 mm. (High speed steel, Type E, ground to a 60 included angle).
8、 Placed in a steel handle as shown in Figure 2 or a file handle as shown in Figure 3. Tool bits and wooden file handles available from: Production Tool Supply (Tip: E-6, Wooden Handle: 001 or L001) 12161 Telegraph Road Redford, MI 48239 Telephone: 1-800-366-3600 Carbide-tipped scriber available from
9、: Aircraft Specialties (#90C) G.T.S. Co (General Scriber #CM88) P.O. Box 98 12015 Telegraph Road Lapeer, MI 48446 Redford, MI 48239 Telephone: (810) 664-2981 Telephone: (313) 531-7666 James Neill Tools (Eclipse Model 225) James Neill Sheffield Ltd. Sheffield S11 8 HB U.K. Towels Paper or cloth. Sodi
10、um Chloride Reagent grade. Hydrochloric Acid Reagent grade. Sodium Hydroxide Reagent grade. Distilled or Deionized Water 10 ppm max dissolved solids per ASTM D 1888. Kaolin Powder, N.F. grade. Stop-off Lacquer Microshield Stop-off Lacquer, or equivalent. Source: Pyramid Plastic Tolber Division P.O.
11、Box 704 Hope, Arkansas 71802-0704 Telephone: (501) 777-3251 or 5759 Test Panels Panels shall be prepared in accordance to FLTM BI 120-01 (for electrocoat systems) or as indicated in the applicable Engineering Materials Specification. FORD LABORATORY TEST METHODBI 123-01Printed copies are uncontrolle
12、d Copyright 2005, Ford Global Technologies, LLC Page 3 of 8 Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5% relative humidity for not less than 24 h prior to testing and tested under the same c
13、onditions unless otherwise specified. Procedure Prepare a 5% salt solution for manual spray as follows: 1. Dissolve 53 g of sodium chloride per liter of distilled or deionized water. Sufficient test solution should be repared to allow samples to be completely immersed for the manual method. 2. Adjus
14、t the solution pH to 6.0 - 8.0 by the addition of hydrochloric acid or sodium hydroxide. 3. For the manual method, replace salt solution and clean out tank when appreciable rust accumulates in the bath and deposits on the samples, or when the pH is outside of the 6.0 - 8.0 range (do not readjust the
15、 pH). 4. (Optional) In instances of extended testing or for paint-coating systems that do not resist corrosive attack at the edges, it may be necessary to mask the edges and holes of the sample parts and the holes, edges and backs of panels with an air-dry stop-off lacquer. Such masking should be de
16、noted in the Materials Engineering Specification. Allow to dry for twenty-four hours. 5. Scribe or condition the panels or parts as indicated by the applicable Materials Engineering Specification. Hold the scriber at a 45 to 60 angle to the part or panel (see Figure 4). Scribe test panels with an “X
17、“ using the straight shank lathe cutting tool bit. When testing zinc coated steels, scribe through the coating to the substrate. A carbide tip scriber may be used for samples with narrow scribe areas or curved surfaces. 6. In order to simulate dust contamination, load a camel hair brush with a small
18、 amount of dry kaolin powder and lightly brush it on the painted surfaces to obtain a uniform, thin, dry coating prior to the initial test cycle only. 7. Wipe the bottom edge of the samples with a towel to remove excess salt, which accumulates during the drain-and-dry period. Use care not to remove
19、the kaolin from the remainder of the panel. 8. Samples shall be suspended from rods on insulated hooks. The intent is to prevent galvanic corrosion resulting from contact with a bare hook. Non-Metallic slotted racks may also be used. After sample preparation run the samples per the test requirements
20、 outlined in the following procedure. FORD LABORATORY TEST METHODBI 123-01Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 4 of 8 Automatic Cabinet Test Procedure: After sample preparation, place the samples in the automated spray test chamber and run per the test r
21、equirements outlined in the following procedure. Automatic Cabinet Procedure Interval Initial test conditions Final test conditions Time 1 23 C and 50% RH Initial salt spraying of samples 1 minute to wet parts 2 23 C and 50% RH 23 C and 50% RH, no spraying 4 minutes, loop to interval 1, three times
22、total 3 23 C and 50% RH 55 C and 10% RH 30 minutes 4 23 C and 50% RH 55 C and 10% RH 2 hours and 30 minutes 5 55 C and 10% RH 50 C and 85% RH 30 minutes 6 50 C and 85% RH 50 C and 85% RH 20 hours & 15 minutes Repeat this 24-hour cycle for the number of total cycles required by the specification. Alt
23、ernate Procedure Evaluation 1. Visually examine samples every five (5) test cycles for blisters, rust and other evidence of deterioration of the coating system and log the results (Figure 1 is a suggested format). 2. Within 30 minutes of completion of the final test cycle (as defined by the Material
24、s Engineering Specification) and after the samples have been evaluated for rust and blistering, perform a tape test as follows: Apply test tape over selected areas of the sample surface and press down firmly. Remove the tape by pulling uniformly at medium speed. Manual Cabinet Test Procedure Interva
25、l Initial test conditions Final test conditions Time 1 Manual Sample Dip (Salt Solution) 23 C Manual Sample Dip (Salt Solution) 23 C 15 minutes immersion to wet parts 2 Drain & Dry 23 C* Drain & Dry 23 C* 3 hours 3 Place in Cabinet 50 C & 85 - 90% RH Remove from Cabinet 50 C & 85 - 90% RH 20 hours a
26、nd 45 minutes Repeat Steps 1 through 3 every 24 hours, Monday through Friday. During weekends and holidays leave the specimens in the humidity cabinet (which continues to operate). FORD LABORATORY TEST METHODBI 123-01Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page
27、5 of 8 General Information This test procedure is used to evaluate the relative corrosion performance of paint coating systems applied to test panels and to car body sheet metal parts. The test can rank and evaluate the capability of paint coating systems, with and without color topcoats, to prevent
28、 corrosive attack at intact painted areas (i.e. unscribed, defect-free), mechanically-damaged or scribed locations, and dissimilar metal joints. This procedure simulates the corrosive conditions of the APG Vehicle Accelerated Corrosion Test (CETP 00.00-R-311) conducted on vehicles at the Ford Arizon
29、a Proving Grounds (APG) and produces coating failure modes that are the same as those observed on the interior and exterior areas of vehicles tested at APG. Corrosion testing of 0.81 mm thick cold-rolled steel, with only one side painted, produces metal perforations within 45 to 55 cycles, i.e., app
30、roximately 70 days. Note: During prolonged holiday periods (over 4 days), the testing should be interrupted and the specimens removed from the humidity cabinet. Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for det
31、ermining proper use and handling in its facilities. FORD LABORATORY TEST METHODBI 123-01Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 6 of 8 FORD LABORATORY TEST METHODBI 123-01Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 7 of 8 FORD LABORATORY TEST METHODBI 123-01Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 8 of 8
