1、 FORD LABORATORY TEST METHODBI 123-03Date Action Revisions 2005 03 08 Revised Automatic/Manual Cabinet test procedure M. Kelly 2004 07 02 Activated J. LaDuke Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 1 of 4 COMPONENT CORROSION TEST Application This test proce
2、dure is used to evaluate the corrosion performance of coatings applied to components. 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: Humidity Cabinet Thermotron Indust
3、ries 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: Humidity Cabinet Thermotron In
4、dustries 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, with cover, of sufficient
5、 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). Towels Paper or cloth. FORD LABO
6、RATORY TEST METHODBI 123-03Printed 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 ASTM D 1888. Kaolin Powder
7、, 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 Components: The components should be positioned as close to vehicle orientation as possible. Sample Preparation
8、: 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 conditions unless otherwise specified. In order to simulate dust contamination, load a camel
9、 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 shall occur only once (prior to testing). (Optional) In instances of extended testing or for pain
10、t-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. The requesting Engineering Activity shall denote such masking on the Laboratory Test Requ
11、est. Allow drying for twenty-four hours. FORD LABORATORY TEST METHODBI 123-03Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 3 of 4 Procedure Automatic Cabinet Test Procedure: After sample preparation place the samples in the temperature/humidity cabinet and run pe
12、r 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 minute to wet parts 2 23 C and 50% RH 23 C and 50% RH, no spraying 4 minutes, loop to interval 1,
13、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 hours & 15 minutes Repeat this 24-hour cycle for the number of total cycles required by the specif
14、ication. 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 test solution should be prepared to allow samples to be completely immersed. Adjust the solution
15、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 is outside of the 6.0 - 8.0 range (do not readjust the pH). After sample preparation run the sa
16、mples 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 Sample Dip (Salt Solution) 23 C 15 minutes to wet parts 2 Drain & Dry 23 C* Drain & Dry 23 C* 3 ho
17、urs 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 bottom edge of the samples with a towel to remove excess salt, which accumulates during the dra
18、in-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 the humidity cabinet (which continues to operate). Note: One test cycle is completed after per
19、forming intervals 1 through 3. FORD LABORATORY TEST METHODBI 123-03Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 4 of 4 Evaluation 1. Visually examine for blisters, rust and other evidence of deterioration of the coating system at the intervals indicated in the L
20、aboratory 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 D 610. Note: To facilitate inspection, the kaolin coating may be removed by gently wiping the sample surface with a soft
21、towel under running tap water. General Information This test procedure is used to evaluate the relative corrosion performance of finishes applied to vehicle components. The test can rank and evaluate the capability of coating systems, with and without color topcoats, to prevent corrosion. In additio
22、n this test can be used to evaluate the effect of component finishes on dissimilar metals if the proper material/materials are used for the samples. 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 determining proper use and handling in its facilities.
