1、A-A-5qZbL 9038054 O000882 TbO . METRIC 14 July 1998 SUPERSEDING 4 April 1991 A-A-59261 MIL-C-46 156A(MR) COMMERCIAL ITEM DESCRIPTION CORROSION REMOVING COMPOUND, SODIUM HYDROXIDE BASE; FOR IMMERSION APPLICATION The General Services Administration has authorized the use of this commercial item descri
2、ption for all federal agencies. 1. SCOPE. This commercial item description (CID) covers one type of alkaline corrosion removal compound suitable for rust, paint, scale, grease, dirt, asphalt and carbon removal by simple immersion from ferrous surfaces. This also covers one type of rejuvenating compo
3、und to be used as an additive for the purpose of prolonging the tank life of the corrosion removal compound. 2. CLASSIFICATION. The types shall be as follows: Type I - Corrosion removing compound. Type II- Rejuvenating additive (for use in replacement of type I solutions,) 3. SALIENT CHARACTERISTICS
4、 3.1 TvDe I. The type I corrosion removing compound shall be equal to or superior in effectiveness to the type I comparison formula of table I, in all respects, when tested in accordance with 3.3 through 3.7. Beneficial comments, recommendations, additions, deletions, clarifications, etc., and any d
5、ata which may improve this document should be sent by letter to: Defense Supply Center Richmond (DSCR), ATTN: DSCR-VBD, 8000 Jefferson Davis Highway, Richmond, VA 23297-5610. AMSC NIA FSC 6850 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for Re
6、saleNo reproduction or networking permitted without license from IHS-,-,-A-A-5926 1 TABLE I. Type I cornmuison formula. Ingredient Sodium hydroxide Mneral seal oil Fluorochemical surfactant Sodium carbonate Sodium salt of sulfonated oleic acid Sodium gluconate Sodium resinate Trisodium salt of N-hyd
7、roxyethyl- ethylenediaminetriacetic acid dihydrate Sodium linear alkyl (aryl) sulfonate (85%) Sodium metaselicate (anhydrous) Zinc silicofluoride, hexahydrate Methyl naphthalene sulfonate Ferric chloride. hexahvdrate Percentage by weight 66.0 1 .o0 0.02 1.62 1 .o0 20.0 0.25 6.50 1 .o0 0.10 1 SO 1 .o
8、0 0.01 3.2 Tme II. The type II rejuvenating additive shall be made in accordance with the formulation given in table II. It shall pass the tests of 3.9 through 3.14. TABLE II. Composition of me II. Ingredient Trisodium phosphate (Na3P0,. 12H20) Mineral seal oil Fluorochemical . When tested in accord
9、ance with the following paragraphs, the compound shall not impart a blue color lighter in appearance than that produced by the comparison formula of table I. 3.3.1 Preuaration of test Danels. The panels, each measuring 65 x 65 x 0.8 millimeter (mm) (2 112 x 2 112 x 1/32 inches), shall be made of Soc
10、iety of Automotive Engineers (SAE) 1020 cold-rolled steel. A 6 mm (1/4 inch) hole shall be drilled in one comer of each panel. Degrease the panels with acetone and polish both faces with emery cloth, stroking in one direction only. Wash with acetone, using a swab of absorbent cotton, dry with paper
11、toweling, dip in absolute ethyl alcohol and dry again with paper toweling. 3.3.2 PreDaration of solution. In a 1200 milliliter (mL) stainless steel beaker, prepare 900 mL each of 36.0 percent (36 grams (g) of compound in 100 mL of solution) solutions in distilled water of both submitted sample and t
12、he type I comparison formula of table I. 3.3.3 Test Drocedure. Bring the solutions prepared as specified in 3.3.2 to a vigorous boil and maintain this temperature throughout the test. Maintain the solution levels by additions of boiling distilled water. Suspend a panel, prepared as in 3.3.1, in each
13、 solution by means of an iron hook, one end of which passes through the 6 mm (1/4 inch) hole and the other end over a glass rod placed across the top of the beaker. After 60 minutes immersion, remove the panels and rinse for 1 minute in 2 liters of boiling tap water contained in a 3-liter beaker. Al
14、low the panels to dry at room temperature and compare the color as described in 3.3. 3.4 Rust removal. When tested as specified below, the panels cleaned by the compound shall not exhibit a more rusted appearance than that exhibited by the panels cleaned by the comparison formula of table I. - - 3.4
15、.1 Preuaration of rusted Danels. The panels, each measuring 65 x 12.5 x 1.25 mm (2 1/2 x 1/2 x 1/20 inches), shall be made of SAE 1010 or 1020 cold-rolled steel. A 6 mm (1/4 inch) hole shall be drilled in one corner of each panel. Thoroughly clean the panels with acetone and expose them to the outsi
16、de atmosphere for 5 months. For each test, four panels shall be fastened together with iron wire (approximately 0.25 mm (0.01 inch) diameter) interwoven to make a flat assembly measuring 50 x 65 mm (2 x 2 112 inches). 3.4.2 Test procedure. Prepare fiesh solutions of the sample and comparison formula
17、 of table I, prepared as specified in 3.3.2, to a vigorous boil and maintain this temperature throughout the test. Maintain the solution levels by additions of boiling distilled water. Suspend a panel, prepared as in 3.3.1, in each solution by means of an iron hook, one end of which passes through t
18、he 6 mm (1 14 inch) hole and the other end over a glass rod placed across the top of the beaker. After 30 minutes immersion, remove the panels and rinse under hot tap water while brushing lightly with a fiber brush. Dry the panels with paper toweling and examine the rusted appearance. 3.5 Stability.
19、 When tested as follows, the panels cleaned by the corrosion removal compound shall not appear more rusted that those cleaned by the comparison formula of table I. Boil the 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59261 9018054 0000885 7
20、7T Ingredient Sodium hydroxide Trisodium salt of N-hydrovethyl- Sodium gluconate or glucoheptonate dihydrate ethylenediaminetriacetic acid dihydrate Tod phosphate (as PO4). A-A-5926 1 Percentage by weight Type I Type II 60.0 min. - 18.0 min. 24.0 min. 3.8 min. 3.9 min. - 13.0 min. i solutions used i
21、n 3.3.3 for 8 hours. Maintain the solution levels by additions of boiling distilled water, than repeat the rust removal test of 3.3.3 with unused panel assemblies. Examine and compare the panels for rusted appearance as before. 3.6 Cleaning efficiency. When tested as specified below, the corrosion r
22、emoval compound shall completely remove mineral oil from steel test panels, the removal being indicated by the absence of any residue or residue stains. 3.6.1 Premration of soiled Danels. The soiling material shall be mineral oil conforming to SAE J1966. Suspend a panel prepared as specified in 3.3.
23、1 on a wire hook and dip into a 400 mL beaker of oil at a temperature of 25 t 2OC (77 f 3F). Remove the panel and allow to drain at the same temperature for 30 minutes. Touch the lower comer of the panel with absorbent cotton to remove the hanging drops of oil. 3.6.2 Procedure. In a fresh boiling so
24、lution of the sample compound prepared as specified in 3.3.2, suspend a soiled panel (3.6.1) by means of an iron hook, one end of which passes through the 6 mm (1/4 inch) hole and the other end over a glass rod placed across the top of the beaker. After 3 minutes immersion, remove the panel and rins
25、e by immersing twice for 6 seconds each time with a 4 second drain between rinses. The rinsing solutions shall consist of two 1-liter beakers, each containing about 800 mL of distilled water at 25 f 2C (77 f 3OF). Dry the rinsed panel in a vertical position at 50 f 1 OC (122 f 2OF) for 15 minutes an
26、d examine for residue. Run this test in triplicate. 3.7 Dusting. Place 25 g of the sample compound in a clean, dry, glass-stoppered 250 mL graduate. Stopper, invert and immediately return to an upright position. After 5 seconds, remove the stopper and suspend a moistened piece of red litmus paper in
27、side so as to not to touch the sides of the graduate. After 60 seconds, remove the indicator paper and examine for color change. Excessive dusting is indicated by any change in the litmus paper from red to blue. 3.8 Ouan titative reauirements. Type I and type II compounds shall meet the quantitative
28、 requirements of table III when tested in accordance with 3.9 through 3.14 as applicable. TABLE III. uantitative reauirements. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-5926 1 TABLE III. Ouantitative requirements - Continued. Ingredient S
29、odium sulfate Percentage by weight Type 1 Type II - 16.0 max. I Zinc (as Zinc silicofluoride) I 1.3 min. I 1.7min. I Minimum requirement for “available” HEDTA as some chelation occurs in the formulation and reduces the amount of excess agent. 3.8.1 Preparation of stock solution (me I corrosion remov
30、ing compound). Carefully weigh 100 g of the compound as rapidly as possible into a liter beaker. While stking, add 800 mL of distilled water. Heat the mixture to near boiling and stir to dissolve all the soluble ingredients. Transfer the solution quantitatively to a liter volumetric flask with water
31、. After cooling to room temperature, fill the flask to the mark and mix well. Filter a large portion of this solution, stopper and set aside for the withdrawal of aliquots as needed in the analytical procedures that follow. 3.8.2 PreDaration of solution (me II reiuvenatina additive). Carefully weigh
32、 100 g of the compound as rapidly as possible into a liter beaker. While stirring, add 800 mL of distilled water. While stirring, adjust the pH of the solution to 3.5 to 4.0 by the addition of concentrated hydrochloric acid (about 25 mL). Heat to boiling, transfer to a liter volumetric flask with wa
33、ter and proceed as in 3.8.1, including the filtration of a portion for aliquot withdrawal. 3.9 Sodium hydroxide. 3.9.1 Preparation of 0.5 N sulfuric acid. Carefully dilute 14 mL of concentrated sulfuric acid to 1 liter with distilled water, mix thoroughly and standardize. 3.9.2 Procedure. Place 200
34、mL of absolute ethyl alcohol and 30 drpps of thymol blue indicator (O. 1 percent in ethyl alcohol) in a 500 mL beaker. From a 25 mL burette, add 10 mL of the standardized 0.5 N sulfunc acid to the beaker. While stirring, add 5 mL of the filtered stock solution (3.8.1) fiom a pipette. Titrate the res
35、idual sodium hydroxide with 0.5 N sulfuric acid from the same burette. Calculation: Percent NaOH = 8.0 X mL of acid X normality of acid 3.1 O Sodium gluconate or alucoheptonate dihydrate. 3.1 O. 1 Preparation of O. 1 N sodium thiosulfate. Dissolve 25 g of reagent grade sodium thiosulfate crystals in
36、 distilled water that has been previously boiled and cooled, and dilute to 1 liter. Add 1 .O g of sodium carbonate, mix and allow to stand a minimum of 24 hours before standardizing with resublimed iodine or reagent grade potassium chromate. 3.10.2 Periodic acid, 0.05 M. Dissolve 1 1.4 g of reagent
37、grade periodic acid dihydrate in distilled water and dilute to 1 liter. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-5926 I 3.10.3 Potassium iodide. 20 Dercent. Dissolve 200 g of potassium iodide crystals in water and dilute to 1 liter volum
38、e. 3.10.4 Procedure (for tyue I corrosion removing comDound onlv). Pipette 35 mL of the filtered stock solution (3.8.1) into a 100 mL volumetric flask and dilute to the mark with distilled water. Pipette 5 mL of this diluted sample into a 500 mL glass-stoppered flask. Simultaneously prepare two blan
39、ks each containing 5 mL of water in place of the aliquot of sample. Add 2 drops of methyl purple indicator to each flask and make acid by the dropwise addition of 6 N sulfuric acid. Pipette 15 mL of the periodic acid solution into each flask, stopper and swirl. Allow the sample and blanks to stand f
40、or 1 hour at room temperature in a dark place. At the end of this time, add 100 mL of water, 25 mL of 6 N sulfuric acid, and 30 mL of potassium iodide solution. Titrate with the standard O. 1 N sodium thiosulfate solution, stking constantly. When the solution is pale yellow, add several milliliters
41、of starch solution and continue to titrate to colorless. Calculation: Percent sodium gluconate or glucoheptonate dihydrate = (d thiosulfate for blank - mL for sample) X normality thiosulfate X 15.6 3.10.5 Procedure (for +nie II reiuvenatincr additive only). Pipette 35 mL of the filtered stock soluti
42、on (3.8.2) into a 100 mL volumetric flask and dilute to the mark with distilled water. Pipette 3 mL of this diluted sample into a 500 mL glass-stoppered flask and proceed as in 3.10.4, except omit the acidification step and calculate as follows: Calculation: Percent sodium gluconate or glucoheptonat
43、e dihydrate = (d thiosulfate for blank - mL for sample) X normality thiosulfate X 26.0 3.1 1 Trisodium salt of n-hvdroxvethvlethvlenediaminetriacetic acid dihydrate (-,O). 3.1 1.1 Pmaration of buffer solution (DH 10). Add 54 g of ammonium chloride and 350 mL of ammonium hydroxide to a liter flask, d
44、ilute to the mark with distilled water and mix. 3.1 1.2 Zinc oxide solution. Weigh exactly 2.0345 g of oven-dried reagent grade zinc oxide into a 500 mL volumetric flask. Dissolve the oxide in some of the buffer solution (3.1 1.1) and dilute to the mark with buffer solution. 3.1 1.3 Eriochrome black
45、 T indicator. 0.5 mrcent. Dissolve 0.50 g of eriochrome black T and 2.2 g of hydroxylamine hydrochloride in 100 mL of methanol. 3.1 1.4 Procedure (for me I corrosion removing commund only). Pipette 30 mL of the filtered stock solution into a 600 mL beaker containing 5 drops of thymol blue indicator
46、(O. 1 percent). 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-,. A-A-5926 1 Add concentrated hydrochloric acid dropwise until the pale blue color changes to yellow. Add 25 mL of the buffer solution and dilute to 300 mL with distilled water. Add 1
47、0 drops of eriochrome black T indicator and titrate with the standard zinc oxide solution to a wine-red endpoint. Calculation: Percent 3Na-EDTAH.2H2O = mL zinc oxide standard X 0.633 3.1 1.5 Procedure (for tme II reiuvenating additive onlv). Proceed as in 3.1 1.4, but omit the addition of the thymol
48、 blue and hydrochloric acid. 3.12 Total Dhowhate. 3.12.1 Ammonium molybdate solution. Mix 55 g of ammonium molybdate tetrahydrate and 50 g of ammonium nitrate with 18 mL of 15 N ammonium hydroxide and 20 mL of water. Stir, dilute to about 700 mL with distilled water, heat for 30 minutes with occasio
49、nal stirring until all of the salts have dissolved. Dilute to 1 liter, let stand overnight, filter, but do not wash the residue. 3.12.2 Procedure. Pipette 10 mL of the filter stock solution from 3.8.2 into a 400 mL beaker. Add 20 mL of concentrated nitric acid and boil gently for 15 minutes. Dilute to 75 mL and add 10 g of ammonium nitrate and warm and stir until all salt has dissolved. If the solution is not clear, filter through fine filter paper using about 25 mL of water f
