GMNA-9981831-1991.pdf
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1、I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I OIL - MINERAL SEAL 9981831 1 SCOPE. This specification details the requirements of a nonsoluble mineral seal oil to be used in the washer section of flex roll and straightener equipment. These materials are used to wash off c
2、ontaminants from sheet metal as it is uncoiled and blanked prior to metal forming operations. This specifrca- tion also covers recycled oil provided it has been segregated and reclaimed in the using plant. Gil re-refined or reclaimed by a commercial source cannot be used. 2 REFERENCED STANDARDS. GM3
3、623M 9981833 ASTM D4-45 GM9532P ASTM D92 ASTM D665A GM961 1P ASTM D96 ASTM D974 GM9613P ASTM D97 GM9615P ASTM D130 3 REQUIREMENTS. Specific material requirements and appropriate test methods are listed under properties. These requirements apply for cold rolled, hot dip, and electrogal- vanized sheet
4、 metal substrates. 3.1 Physical Properties. 3.1.1 Chemical Requirements. No silicone or lanolin com- pound of any kind is allowed in the material. 3.1.2 Viscosity (ASTM D445) at 40C: 4.14 to 5.06 sq mm/s (ISO-5). 3.1.3 3.1.4 3.1.5 3.1.6 3.1.7 3.1.8 Pour Point (ASTM D97) “C, max -0 Flash Point (ASTM
5、D92) “C, min . -104 Copper Corrosion No. (ASTM D130) max .2 Water and Sediment % (ASTM 096) max . 0.1 Total Acid No. (ASTM D974) mg KOWg of oil, max . 0.5 Rust (ASTM D665A). . No rust. 3.2 Process Requirements. 32.1 Compatibility with Structural Adhesive (GM3623M). The material must meet the require
6、ments of GM3623M or limits set by the design engineer. 3.2.2 Welding Requirement (GM9615P). The material must perform comparable to or better than the currently approved reference (control) 9981833. 3.2.3 Compatibility with Phosphate System (GM961 1P). The supplier of the material must have an appro
7、ved GM phosphate system source perform the test. The result must be submitted in writing to the appropriate Paint Engineering Activity. 3.2.3.1 Appearance. Immediately after the final water rinse and before drying, the phosphated surfaces shall exhibit a continuous water film. The dry phosphated sur
8、face on all substrates, when visually compared, shall be uniform (no visible holes in the coating when viewed under 250X and 500X magnification). 3.2.3.2 Phosphate Crystal Size (9613P). The crystal size shall be small when viewed under 250X magnification. Small . . . . . . . . . . . . . . . . . . .
9、. . . . . . . . . . . . . . _ . . . . . . . . . _ . . . . 2 - 10 pm Medium . . . . . . . . . . . . . . . . . _._. 11 -25 pm Large . . . . . . . . . _ _. _ . . . . . _._._ 25 pm 3.2.3.3 Phosphate Coating Mass. Coating mass shall be determined by the weigh-strip-weigh method. Substrate I Coating Mass
10、Wm2) Cold Rolled Steel 1.2 - 2.7 Galvanized 1.6 - 3.3 Aluminum 1.1 - 2.2 NOTE: GM Paint Engineering, not the phosphate supplier, will determine the disposition (pass or reject) based on the results. 3.2.4 ELPO Primer Compatibility (GM9532P). A rating of 6 or better on a scale of 0 to 10 (with 10 bei
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