1、 FORD LABORATORY TEST METHOD BQ 005-07 Date Action Revisions 2000 08 10 Editorial no technical change A. Cockman 1980 05 13 Printed copies are uncontrolled Page 1 of 5 Copyright 2000, Ford Global Technologies, Inc. CORROSION TEST FOR METAL PARTS IN CONTACT WITH SEAT BELT WEBBING Application This pro
2、cedure is used to determine the incidence of corrosion of zinc plated ferrous metals when placed in contact with seat belt webbing material in an atmosphere of high tem perature and high humidity. Scope The webbing material and the zinc plated ferrous metal part are clamped together and placed in a
3、controlled environment. The metal part is then inspected for corrosion, and the corroded area is calculated and reported as a percentage of the total area. Apparatus Required Method A NOTE: Test Method A is preferable over Method B when the necessary facilities are available. Test Chamber Blue M Env
4、ironmental Chamber. Model #CFR 7552BK or equivalent. Sample Ties Ty -Rap Cable Ties #T4525 MX or equivalent. Available from the Thomas and Betts Co., Elizabeth, N.J. Retractor Pawl Ford Part #62612B34 manufactured by the Hamil Mfg. Co. Corrosion Test Evaluation Grid A transparent grid of pliable pla
5、stic, 63.5 x 63.5 mm, marked off in 6.35 mm squares, is used to determine the amount of corrosion on the test specimens. The standard grid shall be rectangular in shape and shall contain 100 squares each 6.35 mm on each side (the lines marking the squares shall not exceed 0.13 mm in width). The perc
6、ent of corrosion is determined by placing the grid in firm contact with the plated surface of the test specimen and counting the grid units containing corrosion defects. FORD LABORATORY TEST METHOD BQ 005-07 Page 2 of 5 Copyright 2000, Ford Global Techno logies, Inc. Conditioning and Test Conditions
7、 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. Procedure Method A 1. Prepare t he test samples by
8、cutting three pieces of webbing 300 mm long. 2. Wrap each piece of webbing tightly around a retractor pawl and secure it with a plastic cable tie. 3. Place the three test samples in a controlled environment of 93 +/ - 1 C at 85 to 100 % relative humidity for 24 hours. 4. Remove the test samples from
9、 the test chambers and place them in a drying oven at 82 +/ - 2 C for 24 hours. Method B Apparatus Required Test Chamber Oven capable of maintaining 93 +/ - 1 C. Sample Jars One litre Mason jars with lids or equivalent. Sample Ties Nylon thread, white or undyed, Ford Engineering Specification #ESB -
10、 M15H43 - A. Retractor Pawl Same as Procedure A. Corrosion Test Evaluation Grid Same as Procedure A. Procedure Method B 1. Prepare the te st samples by cutting three pieces of webbing 30 cm long. FORD LABORATORY TEST METHOD BQ 005-07 Page 3 of 5 Copyright 2000, Ford Global Techno logies, Inc. 2. Wra
11、p each piece of webbing tightly around a retractor pawl and secure it with nylon thread. 3. Pour 200 +/ - 5 mL of deionized or distilled water into each of three one litre jars. Suspend o ne test sample in each jar by running one end of the nylon thread from the sample over the top of the jar, and t
12、hen clamping the thread down with the lid of the jar. (See Figure #1) Place the jars in an oven at 93 +/ - 1 C for 24 hours. 4. Remove the te st samples from the jars and place them in a drying oven at 82 +/ - 2 C for 24 hours. Evaluation Method NOTE: The following evaluation method is to be used fo
13、r both Test Methods A and B. Remove each test sample from the drying oven and determine the am ount of corrosion as follows: A. Determine by visual inspection which side of the pawl has the most corrosion and use that side as the evaluation surface. B. Place the corrosion test evaluation grid over t
14、he pawl. Align the grid to the pawl as shown in Figure #2. Count the number of squares which cover the pawl. At least 50 % of the square must cover the part for it to be counted. C. Count the number of squares in which corrosion cover 50 % or more of the area of the square. D. Report the following:
15、1. The percentage of squares with corrosion. (See following example) 2. Any pawl that exhibits a corrosion spot greater than 9.5 mm diameter circle. EXAMPLE Number of squares with corrosion C x 100 = PERCENT CORROSION B Total area of pawl in squares Chemicals, materials, parts, and equipment referen
16、ced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. FORD LABORATORY TEST METHOD BQ 005-07 Page 4 of 5 Copyright 2000, Ford Global Techno logies, Inc. CORROSION TEST FOR METAL PARTS IN CONTACT WITH SEAT BELT WEBBING Figure 1 Method “B“ FORD LABORATORY TEST METHOD BQ 005-07 Page 5 of 5 Copyright 2000, Ford Global Techno logies, Inc. CORROSION TEST FOR METAL PARTS IN CONTACT WITH SEAT BELT WEBBING Figure 2 Evaluation Grid
