GMSA EMS 9 309 772-1996 ENGINE BLACK ENAMEL - WATER BORNE - FOUNDRY USE.pdf

1、ENGINEERING MATERIAL SPECIFICATION - BRASIL PRODUCT ENGINEERING NAME:ENGINE BLACK ENAMEL -WATER BORNE - FOUNDRY USE 1. 2. 3. SCOPE This specification covers requirements for a water borne, black, air/oven drying enamel, suitable to be applied over cleaned cast iron and alloys, prior to machining ope

2、rations. COMPOSITION Emulsifiable synthetic polymers (modified alkydic cetonic and acrylic emulsion); black pigments (high color retention); plasticizers; balanced, to provide good appearance on painted jobs, even after machining, degreasing, washing operations. The use of non inert pigments, such a

3、s zinc oxide and/or the presence of heavy metals as Cr, Pb, Cd, Ni, etc, is not allowed. (see 8) PHYSICAL PROPERTIES 3.1. - SPECIFIC GRAVITY: (ASTM 0-1 475190) 1.30 f 0.02 g/%m ; 25C 3.2. - SOLIDS CONTENT: (ASTM D-1644/88, Method A) 56 f: 2 %(weight) 3.3. - VISCOSITY: FORD CUP Nr. 4 ; 25C (ASTM D-12

4、00/88) 3.3.1- INCOMING: 42 f: 5secs: 3.3.2- APPLICATION: 3.3.2.1 CONVENTIONAL SPRAYING: 25 - 30secs 3.3.2.2 AIRLESS SPRAY EQUIPMENT: 42 k 5 secs 3.4. - FINENESS OF GRIND: (ASTM D- I 2 1 0/79) 7 h minimum APPROVED BY: EDGARD CENACHI REVISION: 01 /96 PAGE:2/4 EMS - 9.309.772 4. APPLICATION 4.1. - CONV

5、ENTIONAL: Devilbiss GUN JGA - 502; Cap. 797; Air jet AV 51 1 ;Needle JGA 402 - FF. 4.2. - AIRLESS SPRAY EQUIPMENT: 40:l Ratio Pump Airless; PEG model high pressure GUN or similar; air jet no 51 1; (0.01 1 inch. dia; fluid shaping 25 cm at 30 cm distant from part; fluid rate: 230 cm /minute at 35 ATM

6、; 300 %m /minute at 70 ATM; heating unit (I .O00 W), able to reach temperature up to 120C. (Normally two wet coats to reach specified dry film build). 5. DRYING 5.1. - AIR DRYING: Tack Free - 20 minutes To handle - 12 hours Dry hard - 168 hours 5.2. - OVEN DRYING: - Flash off - 10 minutes Baking - 1

7、5 minutes; 85 - 90C. 6. FILM THICKNESS: 40 - 60 ym. (ASTM D 1400187) 7. PAINTED PRODUCT REQUIREMENTS Cold rolled steel panels (300 x 100 mm aprox.), are painted with black enamel, on specified film thickness (6), baked as 5.2.; and aged for 168 hs before start testing. 7.1. - COLOR:. (ASTM D 1729/89

8、) Visual examination : (MACBETH SPECTRALIGHT -SPL - 75 B) As master std. issued by Materials Engineering REVISION:O1/96 EMS -9.309.772 PAGE 3/4 7.2. - GLOSS: 30 - 40 (60“) 7.3. - TAPE ADHESION: minimum 48. (ASTM D 523/89) (ASTM D 3359/92, Method B) 7.4. - FUEL EXPOSURE RESISTANCE: Painted specimens,

9、 after recommended aging,shall withstand the following test: Cleaned beackers of k 300 - 400 ml , are half filled with Regular Gasoline and Ethanol (as released to regular use on gas stations). Painted panels are then immersed for ten times, in each of these fuels, during IO seconds (R.T.), with a 2

10、0 seconds dry off period between each dip. After total cycle, specimens are let to dry off, and painted surface shall not show.any loss of gloss, strong discolouration, wrinkling, blistering, etc. Slight softening is allowed, since the film returns to its original condition in 24 hs maximun, after t

11、esting. 7.5. - OIL RESISTANCE: Painted panels, immersed in SAE 20 w 50 engine oil, during 7 hours, at 70 - 75“C, shall not show any significant surface change, as pointed on item 7.4. 7.6. - CORROSION CREEPBACK RESISTANCE: ( GM 9102 P - For Scribing procedure ; GM 4298 P - To Conduct Salt.Spray Test

12、 - ASTM - D 1654 - 92 item 7.3 - For Rating results ) 96 hours exposition, without loss of adhesion, blistering, or rust creepback beyond 3 mm of the scribed line. (rate 6 minimum) 7.7. - In addtion to above referred requirements, material shall be submitted to a prior production trial, to evaluate

13、its intrinsical performance, on and after machining operations, as well as subsequently alkaly degreasing, and final washing. 8. Safety and environmental information shall be submitted to Purchasing Dept. on special forms, related to safety and hazardous properties. Ref. source: AKZO - LAW 5001 REVISION:01/96 NUMBER: EMS - 9 309.772 ENGINEERING MATERIAL SPECIFICATION 05/95 BRASIL PRODUCT ENGINEERING - REVISIONS CHANGE ID. - - - I I I SPECIFICATION RELEASE: l- PREPARED BY: E. CENACHI APPROVED BY:C. R. HERRMANN Fo. DOCUMENT I DATE DESCRIPTION TOTALLY REVISED 108/95 3EVISED 01/96 APPROVAL