1、 FORD LABORATORY TEST METHOD AQ 101-02 Date Action Revisions 2001 01 31 Revised Editorial no technical change A. Cockman 2000 04 20 Editorial no technical change A. Cockman 1990 10 09 Printed copies are uncontrolled Page 1 of 2 Copyright 2001, Ford Global Technologies, Inc. DETERMINATION OF PHOSPHAT
2、E COATING WEIGHTS CAUSTIC SODA METHOD Application This procedure is used to determine the coating weight of iron and zinc phosphate on steel parts, but is not satisfactory for the determination of manganese phosphate. Manganese phosphate should be determined by FLTM AQ 101-01. Apparatus and Reagents
3、 Required Analytical Balance Mechanical Convection Oven Capable of maintaining a constant temperature of 100 +/- 2 C. Test Panels Steel body skin panels 150 mm x 300 mm. Surface finish 1.4 +/- 0.3 micrometers. Process three panels through a complete cycle of the phosphate coating system under test,
4、including cleaning, phosphating, acid rinse (if required), and drying. Caustic Soda Stripping Solution Dissolve 5 g of Sodium Hydroxide and 1 g of Sodium Tartrate in 100 mL of distilled water. Replace the solution when stripping action is no longer satisfactory. Desiccator Ether or Acetone Condition
5、ing 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 conditions unless otherwise specified. FORD LABORATORY TEST METHOD AQ
6、 101-02 Page 2 of 2 Copyright 2001, Ford Global Technologies, Inc. Procedure 1. Cut a 100 mm x 100 mm specimen from each of the test panels in such a way that all edges are cut. Deburr after cutting. 2. Degrease and remove any soil by pouring the acetone or ether over the panels. Dry the panels by p
7、lacing in the oven for five minutes. 3. Cool in a desiccator and weigh each specimen to the nearest milligram. 4. Immerse the specimens in the stripping solution and allow to soak for 2 minutes to loosen the coating. 5. Hold the specimen with a rubber stopper and remove the phosphate coating by scru
8、bbing both sides of the specimens with a rubber policeman. 6. Remove the specimens and rinse thoroughly in cold running water. Blot and then dry in the oven at 100 +/- 2 C. 7. Cool in the desiccator and reweigh. 8. Repeat steps 4, 5, 6 and 7 to a constant weight. Evaluation Calculate the coating wei
9、ght in g/m2 as follows: W = (W2 - W1) x 10 A Where: W = Coating weight in g/m2 W2 = Weight of specimen before dipping in stripping solution in mg W1 = Weight of specimen after removal of coating in mg A = Area of specimen in cm2 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.
