FORD FLTM BQ 007-01-2000 FORD ANODIZED ALUMINUM CORROSION TEST (F A C T )《福特阳极化铝腐蚀试验(F A C T)》.pdf
《FORD FLTM BQ 007-01-2000 FORD ANODIZED ALUMINUM CORROSION TEST (F A C T )《福特阳极化铝腐蚀试验(F A C T)》.pdf》由会员分享,可在线阅读,更多相关《FORD FLTM BQ 007-01-2000 FORD ANODIZED ALUMINUM CORROSION TEST (F A C T )《福特阳极化铝腐蚀试验(F A C T)》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、 FORD LABORATORY TEST METHOD BQ 007-01 Date Action Revisions 2000 11 09 Editorial no technical change A. Cockman 1992 08 04 Printed copies are uncontrolled Page 1 of 6 Copyright 2000, Ford Global Technologies, Inc. FORD ANODIZED ALUMINUM CORROSION TEST ( F.A.C.T. ) Application This procedure describ
2、es an accelerated test for determining the resistance to corrosion of anodized aluminum parts. Scope The procedure determines the corrosion resistance of an anodic c oating by indirectly measuring its electrical resistance while it is being attacked electrolytically. The cumulative (integral) D.C. v
3、oltage drop across a test specimen during a specified period of time is used as the measure which establishes a FACT valu e for the coating. Apparatus and Solutions Required F.A.C.T. Instrument The apparatus required for F.A.C.T. testing consists of a cell assembly with a corrosion resistant anode,
4、an electrolyte holder with a gasket which seals to the surface being tested , a suitable electrolyte, a clamp with a pointed screw to contact the basis aluminum, a source of D.C. power, a series resistance to cause the voltage across the cell to be dependent on the cell resistance, and a means for i
5、ntegrating the voltage across th e cell during a predetermined test period. The apparatus which has successfully produced the conditions required by this method is shown schematically in Figure 1. Source: Electronic Applications Specialists, Inc. 1250 Holden Milford, MI 48042 (313) 685 - 8283 The fo
6、llowing are the circuit parameters: 1. Output voltage of power source = 46 V +/ - 1 %. Regulation: line and load +/ - 0.05 %. 2. Series resistance, R1 = 54 kilohms (nominal value, adjusted so that with R3 in circuit, voltage across R2 + R3 = 4.16 V). 3. Calibration resistance, R3 = 5 kilohms +/ - 0.
7、25 %. Scale adjust resistance, R2 = 560 ohms +/ - 1 %. 4. Potential across calibration resistance, R3 = 3.74 V. FORD LABORATORY TEST METHOD BQ 007-01 Page 2 of 6 Copyright 2000, Ford Global Technologies, Inc. 5. Potential across R2 + R3 = 4.16 V. (This voltage integrated for 180 seconds = 749 volt -
8、seconds.) 6. Test period = 180 s +/ - 0.2 %. 7. Integrator: Input resistance = 10 megohms. Accuracy (with 5 kilohms calibration resistance and180 s test period). 749 volt - seconds +/ - 1 %. 8. Resistance, R4 = 156 kilohms +/ - 1 %. 9. Milliameter: 0 - 1mA D.C. 10. Glass tube: 9 mm O.D., 6.3 mm I.D.
9、, 76 mm. 11. Rubber gasket with a 3.17 mm hole. Kocour gasket “A.“ Source: Kocour 4800 S. St. Louis Avenue Chicago, IL 60632 12. The anode is a platinum rod, 2.06 mm diameter, 89 mm long. It is held in a Fahnestock clip and 25.4 mm +/ - 20 % of the rod is immersed in the electrolyte. 13. Electrolyte
10、 - CASS solution as described below. Height of electrolyte in glass tube 38 mm +/ - 20 %. Note: Older equipment not meeting these parameters may be used only with the concurrence of Division Chemical and Metallurgical or SQA. pH Meter Curtin Matheson Catalog No. 138 - 4040 or equivalent. Electrolyte
11、 The CASS electrolyte used in the probe is made up as follows: Distilled water - 5 ppm max total dissolved solids. Sodium Chloride - NaCl reagent grade. Cupric Chloride CuCl2 2H2O reagent grade. Acetic Acid - glacial reagent grade. Weigh 200 g of sodium chloride and 1.0 g of cupric chloride, dissolv
12、e in 3.8 L of distilled water and mix thoroughly . The pH of the solution at this point should be between 5.0 and 6.0. Adjust the pH of the solution to be between 3.0 and 3.2 with acetic acid. It has been determined that variations in the input resistance of pH meters (causing different amounts of c
13、ur rent to be drawn from the pH cell) may affect the pH reading of poorly poised solutions such as the F.A.C.T. electrolyte. The readings for well - buffered solutions (which are not affected by the current drawn) however, will be correct. Consequently, in ad dition to checking the pH meter with sta
14、ndard buffer solutions of pH 2.0 and 4.0, a titration method should be used to check for the correct amount of acetic acid in the electrolyte. FORD LABORATORY TEST METHOD BQ 007-01 Page 3 of 6 Copyright 2000, Ford Global Technologies, Inc. The method consists of titrating 25 mL of electrolyte, to wh
15、ich 3 drops of phenolphthalein have been added, with 1 normal sodium hydroxide to a pink end point. The amount of sodium hydroxide used should never be less than 0.4 mL or more than 1.0 mL. If the solution was made too acid, it should not be brought back to the corr ect pH by adding sodium hydroxide
16、. Consequently, a low pH solution should be discarded and a new one made. Experience has shown that the maximum amount of acetic acid added should not exceed 10 mL/38 L for a properly prepared solution. Accessories Items which are not provided with the F.A.C.T. instrument, but which are useful in co
17、nducting tests are as follows: 1. Support Stand - Large size, such as Fisher Scientific Co. Catalog No. 14 - 670, to support probe. 2. Utility Clamp - To hold probe - Fisher N o. 5 - 766. 3. Eye Dropper - Large size with plastic tubing extension for removal of electrolyte and rinse water from probe.
18、 4. Washing Bottle - Polyethylene - 500 mL, such as Fisher No. 3 - 409 - 10. These are used for filling and rinsing probe. 5. Wooden Blocks - Four 50 x 100 x 200 mm wood blocks, used in positioning of parts. 6. Modeling Clay - Used in positioning of parts. Conditioning and Test Conditions All test v
19、alues indicated herein are based on material conditioned in a controlled atmosphere o f 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 Circuit Calibration After a warm -up period, a chec
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