ASTM C694-1990a(2016) Standard Test Method for Weight Loss (Mass Loss) of Sheet Steel During Immersion in Sulfuric Acid Solution《在硫酸溶液浸泡期间薄钢板重量损失(质量损失)的标准试验方法》.pdf
《ASTM C694-1990a(2016) Standard Test Method for Weight Loss (Mass Loss) of Sheet Steel During Immersion in Sulfuric Acid Solution《在硫酸溶液浸泡期间薄钢板重量损失(质量损失)的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C694-1990a(2016) Standard Test Method for Weight Loss (Mass Loss) of Sheet Steel During Immersion in Sulfuric Acid Solution《在硫酸溶液浸泡期间薄钢板重量损失(质量损失)的标准试验方法》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C694 90a (Reapproved 2016)Standard Test Method forWeight Loss (Mass Loss) of Sheet Steel During Immersionin Sulfuric Acid Solution1This standard is issued under the fixed designation C694; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、 case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.INTRODUCTIONIn the manufacture of porcelain-enameled ware, some formed steel articles are pretreate
3、d with acidand a nickel deposit to ensure one coat enamel adherence. The pretreatment comprises, in part, ofetching the steel surface with sulfuric acid solution and in depositing nickel on the steel surface froma nickelous sulfate solution. Conditions are maintained to provide a minimum amount of m
4、etalremoval (weight loss) (mass loss) in the acid solution and a minimum amount of nickel deposition.These minimums are particularly critical in direct-on enameling in which the ground-coat enamel withits adherence promoting oxides is omitted.1. Scope1.1 This test method covers the evaluation of the
5、 weight-loss (mass loss) characteristics of sheet steel in sulfuric acidsolution.1.2 This test method provides means of rating the effective-ness of in-plant pretreatment acid solutions in preparing steelsurfaces for porcelain enameling.1.3 The values stated in inch-pound units are to be regardedas
6、the standard. The values in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the appli
7、ca-bility of regulatory limitations prior to use.2. Terminology2.1 Definitions:2.1.1 quarter linesimaginary lines parallel to the directionof rolling, positioned at a distance from the sheet mill edgeequal to one quarter of the sheet width.3. Summary of Test Method3.1 Representative sheet-steel spec
8、imens are selected,measured, cleaned, and weighed prior to immersion for mea-sured periods in a bath of dilute sulfuric acid that has beenpreconditioned by controlled solution of panels of the samesheet steel. The specimens are rinsed, dried, and reweighedafter the timed exposure.3.2 Values of weigh
9、t loss (mass loss) per unit area arecalculated for the four acid immersion periods and, if desired,the rate of weight loss (mass loss) per unit area per unit time iscalculated.4. Significance and Use4.1 The results of this test method can be used to evaluatethe pickle weight-loss (mass loss) charact
10、eristics of a given lotof sheet steel in dilute sulfuric acid solution, and may enablethe enamel processor to select a pickling time that will providesatisfactory porcelain enamel bond.4.2 The results of this test method can be used to evaluatethe effectiveness of the enamel processors pretreatment
11、sys-tem in preparing the steel for porcelain enameling, and may aidthe processor in obtaining satisfactory porcelain enamel bond.5. Apparatus5.1 Analytical Balance, accurate to 0.01 g.5.2 Linear Measuring Device.5.3 Borosilicate Glass Container, having an inside diameterof about 1112 in. (290 mm) an
12、d an outside depth of about 11 in.(280 mm).5.4 Water Bath, heated, of sufficient size to immerse theglass container (5.3) to within about 1 in. (25 mm) of its top.5.5 Glass Plate or Acid-Resistant Porcelain-Enameled SteelSheet, sufficient to cover the container described in 5.3.1This test method is
13、under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatingsand is the direct responsibility of Subcommittee B08.12 onMaterials for Porcelain Enamel and Ceramic-Metal Systems.Current edition approved Nov. 1, 2016. Published November 2016. Originallyapproved in 1971. Last previous ed
14、ition approved in 2011 as C694 90a (2011).DOI: 10.1520/C0694-90AR16.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.6 Stainless Steel Jig, for support of test specimens (seeFig. 1, Fig. 2, and Fig. 3).6. Reagents and Materials6.1 Di
15、stilled Water.6.2 Isopropyl Alcohol (CH3)2CHOH).6.3 Methyl Alcohol (CH3OH).6.4 Steel Sheet, sufficient in size to provide the panels andstrips described in 6.4.1 and 6.4.2, and to provide the testspecimens described in 7.1 and 7.1.1.6.4.1 Shear two to four 4 by 6-in. (102 by 152-mm) panelsfrom the s
16、teel sheet of 6.4. Use these panels in the precondi-tioning in accordance with 9.3.3 and 9.3.4.6.4.2 Shear ten to twelve14 by 5-in. (6 by 127-mm) stripsfrom the steel sheet of 6.4. Fashion these strips into hooks forhanging test specimens from the stainless steel jig.6.5 Sulfuric Acid (H2SO4), Ameri
17、can Chemical Society(ACS) reagent grade.6.6 Trisodium Phosphate(Na3PO412H2O), granular,technical grade.7. Sampling7.1 Shear eight test specimens, each 4 by 6 in. (102 by 152mm), from within the quarter lines of the sheet or coil.7.1.1 Choose specimens from rust-free areas that do notcontain the mill
18、 identification stamp.7.1.2 Identify the specimens by steel die stamping.8. Test Specimens8.1 File edges of the eight test specimens lightly to removeshearing burrs.8.1.1 Punch or drill a hole near one end, at the center of thespecimen width.8.1.2 Determine the width, W, and length, L, of the testsp
19、ecimens to the nearest 0.01 in. (nearest 1 mm).8.1.3 Thoroughly clean the specimens with methyl alcohol.(Thereafter, handle the specimens by the edges with cleanwhite gloves.)8.1.4 Dry in still air.8.1.5 Store the specimens in a desiccator until ready forweighing.8.2 Determine the initial weight (ma
20、ss), W1, of each testspecimen to the nearest 0.01 g.8.2.1 Store the specimens in a desiccator until ready to runthe test.9. Preparation of Solutions9.1 CleanerPrepare at least 19 L of 5 6 0.5 weight (mass)percent solution using 53 g of trisodium phosphate per litre oftap water.Metric Equivalentsin.1
21、4 456(mm) (6) (102) (127) (127)NOTE 1All materials are of Type 316 stainless steel.FIG. 1 Specimens Suspended from Stainless-Steel JigC694 90a (2016)29.1.1 Control the cleaner temperature at 190 to 195F (88 to91C).9.2 Cleaner RinseAt least 19 L of tap water.9.2.1 Control the rinse temperature at 170
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