1、 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. AUGUST 2009 Page 1 of 4 NAVISTAR, INC. CEMS (CORPORATE ENGINEERING MATERIAL SPECI
2、FICATION) NUMBER: CEMS BT-9 TITLE: Humidity Corrosion Test CURRENT ISSUE DATE: August 2009 WRITTEN/REVIEWED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES ISSUE OF: October 2001 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This specification may invo
3、lve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to determine the applicability of regulatory limits prior to use. Change
4、 Notice: Replaced “International Truck and Engine Corporation” with “Navistar, Inc.” per corporate directive. 1.0 SCOPE This method covers a test procedure for determining the corrosion protection offered by various materials to a finished ferrous surface under dynamic humidity conditions. 2.0 APPAR
5、TUS (1) 500 milliliter Erlenmeyer flask, wide mouth (see Figure 1). (2) 25 milliliter Erlenmeyer flask (see Figure 1). (3) Modified No. 10 rubber stopper (see Figure 1). (4) Bath capable of maintaining a temperature of 90 + 1 F (32.2 + 0.6 C). (5) Water jacket (see Figure 2). (6) Test tube, 25 x 150
6、 millimeters. (7) Drill or lathe rated at 2500 revolutions per minute. (8) 30 milliliter polyethylene beaker. (9) Bath, controlled at 80 + 1F (26.7 + 0.6C) with pump capable of circulating solution through water jacket. 3.0 MATERIAL (1) Test specimen: The test specimen is made from 0.56 inch (14 mm)
7、 diameter cold drawn bar of 1018 steel and finished to 11 microinches (0.28 mm), AA, max. Finished part from vendor must be free from scratches and rust and must be protected for storage by coating with MIL-C-15074B fluid (see Figure 3). (2) Toluene, ACS. (3) Isopropanol, ACS. (4) Carborundum Aloxit
8、e Flexbac Metal Cloth Strip, Grade A-320, 1 inch (25 mm) wide. (5) Distilled water. (6) Kleenex or equivalent. (7) Plastic or rubber gloves. 4.0 PROCEDURE 4.1 The rod specimens will be given a preliminary cleaning by immersing in a hot 50% mixture of toluene and isopropanol to remove rustproof coati
9、ng. NUMBER: CEMS BT-9 TITLE Humidity Corrosion Test CURRENT ISSUE DATE: August 2009 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc
10、. AUGUST 2009 Page 2 of 4 4.2 Chuck the test specimen in a lathe or drill (fixed position) and run at 2500 revolutions per minute. Use a 14 x 1 inch (360 x 25 mm) strip of the abrasive cloth and pass slowly from the chuck end to the specimen tip. Pull the abrasive cloth slowly from one end to the ot
11、her in opposition to the rod rotation to provide a fresh surface on the paper while progressing down the specimen. The pass should take approximately 20 seconds. Make three passes using a new strip of abrasive cloth each time. Final overall specimen finish will range from 9 to 14 microinches (0.23 t
12、o 0.36 mm) AA, except for the chucking area. CAUTION: Do not use chucking area as test portion. 4.3 Rinse rods with toluene and wipe clean with toluene-soaked Kleenex. Rinse again with toluene followed by dipping in clean toluene at 135F (57C) for 15 seconds, then clean isopropanol at 120F (49C) for
13、 15 seconds. Remove any adhering drop at bottom of rod with clean piece of Kleenex after each dipping. 4.4 Allow to dry and immediately immerse the 6 inch (150 mm) test section of the specimen 6 times per minute for 1 minute in a test tube containing 40 milliliters of the fluid to be tested. Use a f
14、resh sample of fluid for each specimen dipped. 4.5 After the last dip, place the test section of the rod in a plastic beaker (on a nonskid surface) containing approximately 1 inch (25 mm) of test fluid. Push the predrilled rubber stopper down the rod until a 3 inch (75 mm) section protrudes. Hang th
15、e rod vertically by the exposed 3 inch (75 mm) section and allow the test fluid to drain for 30 minutes. Next, place the rod vertically in a 500 milliliter flask containing 100 millitres of distilled water and a 25 milliliter flask containing 15 milliliters of distilled water. Place the 25 millilite
16、r flask so that test fluid from the rod cannot enter this flask (See Figure 1). 4.6 Immerse the assembly to the bottom of the stopper in the bath maintained at 90 + 1F (32.2 + 0.6C). Place a water jacket as shown in Figure 2, over the exposed 3 inches (75 mm) of rod and circulate water controlled to
17、 80 + 1F (26.7 + 0.6C) maintaining a 10F (6C) differential. 4.7 At the end of the specified time period, the rod will be vapor cleaned with a boiling mixture of 50% toluene and isopropanol. 4.8 Test to be run in triplicate. 4.9 Examine rods with the unaided eye for rust spots. Failure is defined as
18、six or more spots per any linear inch (25 mm). The first 0.38 inch (10 mm) below the contact line of the stopper with the rod will be disregarded. Two specimen failures will be cause for rejection. 5.0 REPORT Report pass or fail. NUMBER: CEMS BT-9 TITLE Humidity Corrosion Test CURRENT ISSUE DATE: Au
19、gust 2009 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. AUGUST 2009 Page 3 of 4 NUMBER: CEMS BT-9 TITLE Humidity Corrosion Test CURRENT ISSUE DATE: August 2009 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2009 by Navistar, Inc. AUGUST 2009 Page 4 of 4
