1、 FORD LABORATORY TEST METHODBI 123-02Date Action Revisions 2005 03 08 Revised Automatic/Manual Cabinet procedure M. Kelly 2004 07 02 Activated J. LaDuke Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 1 of 4 COATED FASTENER CORROSION TEST Application This test proc
2、edure is used to evaluate the corrosion performance of coatings applied to fasteners and mounted on test panels. It is designed to simulate the corrosive conditions of the Arizona Proving Ground (APG) Vehicle Accelerated Corrosion Test (CETP 00.00-R-311). Apparatus Required Automatic Method: Humidit
3、y Cabinet Thermotron Industries 291 Hollen Park Drive Holland, MI 49423 (616) 392-1491 Automated Cyclic Corrosion Test Chamber, model ACT-30-CHM-1, or equivalent, with forced air circulation, temperature control of +/- 2 C to 65 C and relative humidity control of +/- 2% up to 90%. Manual Method: Hum
4、idity 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%. Materials Required Tank Polyethylene or plastic-lined tank
5、, with cover, of sufficient size and capacity to permit the test samples to be sprayed with 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). Towel
6、s Paper or cloth. FORD LABORATORY TEST METHODBI 123-02Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 2 of 4 Sodium Chloride Reagent grade. Hydrochloric Acid Reagent grade. Sodium Hydroxide Reagent grade. Distilled or Deionized Water 10-ppm max dissolved solids per
7、 ASTM D 1888. Kaolin Powder, N.F. grade. Stop-off Lacquer Microshield Stop-off Lacquer, or equivalent. Source: Pyramid Plastic Tolber Division P.O. 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 electroco
8、at systems) or as indicated by the requesting Engineering activity. Panels shall be placed in slotted racks, such as used in salt spray testing at an angle of approximately 25 +/- 5 from vertical. The fasteners shall be driven into the panel at a right angle, and shall be alternately positioned in s
9、uch a manner as not to allow corrosion bleeding from one fastener to another. Sample Preparation: 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 s
10、ame conditions unless otherwise specified. In order to simulate dust contamination, load a camel hair brush with a small amount of dry kaolin powder and lightly brush it on the painted surfaces to obtain a uniform, thin, dry coating. (Remove kaolin from any masked areas) The application of kaolin sh
11、all occur only once (prior to testing). (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 lac
12、quer. The requesting Engineering Activity shall denote such masking on the Laboratory Test Request. Allow drying for twenty-four hours. FORD LABORATORY TEST METHODBI 123-02Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 3 of 4 Procedure Automatic Cabinet Test Proce
13、dure: After sample preparation place the samples in the temperature/humidity cabinet and run per the test requirements 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 min
14、ute to wet parts 2 23 C and 50% RH 23 C and 50% RH, no spraying 4 minutes, loop to interval 1, three times 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 hou
15、rs & 15 minutes Repeat this 24-hour cycle for the number of total cycles required by the specification. Alternate Procedure Manual Cabinet Test Procedure: Prepare a 5% salt solution for manual spray as follows: Dissolve 53 g of sodium chloride per liter of distilled or deionized water. Sufficient te
16、st solution should be prepared to allow samples to be completely immersed. Adjust the solution pH to 6.0 - 8.0 by the addition of hydrochloric acid or sodium hydroxide. Replace salt solution and clean out tank when appreciable rust accumulates in the bath and deposits on the samples, or when the pH
17、is outside of the 6.0 - 8.0 range (do not readjust the pH). After sample preparation run the samples per the test requirements outlined in the following procedure. Manual Cabinet Procedure Interval Initial test conditions Final test conditions Time 1 Manual Sample Dip (Salt Solution) 23 C Manual Sam
18、ple Dip (Salt Solution) 23 C 15 minutes 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 and 45 minutes Repeat this 24-hour cycle for the number of total cycles required by the specification. *Note: Wipe the
19、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 the kaolin from the remainder of the panel. Repeat intervals 1 through 3 every 24 hours, Monday through Friday. During weekends and holidays leave the specimens in
20、 the humidity cabinet (which continues to operate). Note: One test cycle is completed after performing intervals 1 through 3. FORD LABORATORY TEST METHODBI 123-02Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 4 of 4 Evaluation 1. Visually examine for blisters, rus
21、t and other evidence of deterioration of the coating system at the intervals indicated in the Laboratory Test Request by the requesting Engineering Activity. If the percentage red rust is required, the test samples shall be rated in accordance with the rating scale in ASTM D610. Note: To facilitate
22、inspection, the kaolin coating may be removed by gently wiping the sample surface with a soft towel under running tap water. General Information This test procedure is used to evaluate the relative corrosion performance of fastener finishes applied to test panels and to vehicle components. The test
23、can rank and evaluate the capability of coating systems, with and without color topcoats, to prevent corrosion. In addition this test can be used to evaluate the effect of fastener finishes on dissimilar metal joints if the proper material/materials are used for the test panels. Note: During prolong
24、ed 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 determining proper use and handling in its facilities.
