1、 NON-PRODUCTION MATERIAL SPECIFICATION Material Name Specification Number Date Action Changes 2010 03 09 N-STATUS No replacement named L. Sinclair, NA 1991 04 01 Page 1 of 1 CONDENSER FINAL RINSE - STEEL W-M3B71-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE: The material defined by this standard is a wat
2、er (10 grains CaCO 3 equivalent max, as determined by conductivity measurement) diluted chromic/phosphoric acid final rinse. It is intended to impart a corrosion resistant coating and a base for subsequent application of organic finish or paint on steel and/or galvanized parts which have been proces
3、sed through a chromate conversion coating system. 2. APPLICATION: This as received solution is reduced with water and used as a final rinse for protective coating on steel and/or galvanized parts (such as brackets, end sheets, and receiver driers) in association with aluminum condenser assemblies. I
4、t may be used for the treatment of other products of the same general description and/or material. 3. REQUIREMENTS: 3.1 CHEMICAL COMPOSITION: Chromium: 24-28 g/L (Atomic Absorption) Phosphorous: 2.60-2.95 g/L 3.2 PH 1% SOLUTION: 2.5-3.5 (ASTM E 70) 3.3 SPECIFIC GRAVITY: 60 F (15.6 C) 1.050-1.055 (AS
5、TM D 1298) 3.4 FOAMING: Room temperature, rinse shall be nonfoaming (FLTM BT 101-01) 14% by volume after 5 minutes stirring, 10 minutes standing. 3.5 PERFORMANCE: This material, when used according to W-PL 55-05, must provide that level of salt fog protection to steel and galvanized parts as required by the applicable engineering drawing. 4. STANDARD PARAGRAPHS: The following standard paragraphs as defined in Manufacturing Standard MBX are herewith made a part of this standard: C1, C2 (initial approval only), P1, P2, P3, R1, R2.
