1、A.C.N. 006 893 232Holden LimitedEngineering DepartmentLABORATORY TEST METHODNUMBERSHEETRELEASEREVISION:HN 02011 of 2September, 1982NAME: CRYSTAL SIZE DETERMINATION USING “FAXFILM” REPLICATIONTHIS DOCUMENT MUST NOT BE REPRODUCED. IF USED IN RELATION TOTHE COMPANYS PRODUCTS THE RECIPIENT IS RESPONSIBL
2、E TOCONFIRM THE DOCUMENT ISSUE DATE IS STILL VALID.FORM : I:LABRTORYFORMSTDMATTEST.DOC1. GENERAL DESCRIPTIONThis method outlines the procedure required to obtain an estimating of thecrystal size of zinc phosphate coatings on metal substrates using the “Faxfilm“replication technique. The replicas are
3、 examined by microscope to estimatecrystal size. This method is derived from Fisher Body Test Method 55-36.2. EQUIPMENT REQUIREDA. “Faxfilm“ Replicating Solution, N-7.B. “Faxfilm“ Replicating Tape #3005C. “Faxfilm“ Viewing Frames #7070A, B & C may be obtained from Ladd Research Industries, P.O. Box
4、901,Burlington, Vt. 05401.D. Microscope - Bausch & Lomb - 50 to 200 x Zoom, Model ST Z203.Available from VWR Scientific, 3140 Grand River, Detroit, MI. VWR#40923-057 Microscope Illuminator - Bausch & Lomb Rite-Lite #31-33-10.Not in VWR catalog but can be obtained from them using the B.& L.number.E.
5、Crystal Size Standards - Obtain from GMH Central Laboratory.3. PROCEDUREA. Cut off an appropriate length of replicating tape (approx. 20mm long).B. Brush a drop or two of replicating solution on the surface to be tested.The metal should not be hot or the solution will be dry before the tapecan be ap
6、plied.C. Press the replicating tape firmly on the solution-coated area. Be carefulto apply the tape so as to squeeze out air bubbles.Note: As it comes from the roll, the film has a slight natural bow to it.Apply the tape with the bowed side up.D. Allow the tape to dry from one to three minutes befor
7、e stripping.A.C.N. 006 893 232Holden LimitedEngineering DepartmentLABORATORY TEST METHODNUMBERSHEETRELEASEREVISION:HN 02012 of 2September, 1982NAME: CRYSTAL SIZE DETERMINATION USING “FAXFILM” REPLICATIONTHIS DOCUMENT MUST NOT BE REPRODUCED. IF USED IN RELATION TOTHE COMPANYS PRODUCTS THE RECIPIENT I
8、S RESPONSIBLE TOCONFIRM THE DOCUMENT ISSUE DATE IS STILL VALID.FORM : I:LABRTORYFORMSTDMATTEST.DOC3. PROCEDURE (continued)E. Strip the replica from the surface slowly. The replica should strip cleanlyfrom the surface leaving no residue. Phosphate should not be strippedfrom the substrate. If any resi
9、due of replicating material is left on thesurface, wipe it off with lacquer thinner before painting.F. Mount the replica in viewing frame and glue the frame together to hold thereplica firmly in place. Label the viewing frame with proper identification - date, time, location, operation, conditions,
10、etc.G. The replica can be examined with a microscope. Magnification of 200 isrequired to obtain large enough image to measure smaller crystals.Adjust the lighting to obtain the best contrast.H. Estimate the length of several crystals that appear to be typical. Aphosphate coating will have crystals of many sizes, but one size categoryusually prevails.I. Compare the length of the crystals with these of the standards.Note: Crystal size standard photos are obtained from GMH CentralLaboratory.
