1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2009 05 28 N-STATUS No Replacement Named L. Sinclair, FNA 2002 08 23 Revised Updated and renumbered 1978 12 21 Released SM/EQ 8481 TP Printed copies are uncontrolled Page 1 of 1 Copyright 2009, Ford Global T
2、echnologies, Inc. PHOSPHATE SOLUTION, ZINC, PASSIVATING SK-M5B9580-A SOLUTION NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a chromate (CrIII) passivating solution. 2. APPLICATION This specification was released originally for materials used as passivating agen
3、ts with zinc phosphate coating. It is used in combination with SK-M5B9580-B, Phosphate Solution, Zinc, pH Correction Agent. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Mater
4、ials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION Cr III as Cr 5.0 +/- 0.5 % Test Method: 10 ml of the solution are filled up to 1000 ml with distilled water. 15 ml of this solution are mixed with 10 ml sodiumhydroxide solution (10 % by weight) and 10 ml hydrogen-peroxide solution (30 % by weight) and
5、 heated up to boiling. Leave boiling for 30 minutes and cool down. Add 20 ml of a diluted sulphuric acid (25 % by weight) and 3 g potassium iodide. Titrate with 0.1 n sodium thio-sulphate solution against starch (2ml of a 1.0 % containing solution in water), from blue-black to water white. Consumption: 5.0 +/- 0.5 ml 0.1 n sodium thiosulphate solution. 3.3 DENSITY, g/cm31.17 +/- 0.02 (FLTM EU-BI 2-2) 3.4 pH VALUE 1 % SOLUTION BY WEIGHT 4.0 +/- 1.0
