1、 FORD LABORATORY TEST METHOD EU-BI 053-02 Date Action Revisions 2001 03 13 Revised Editorial no technical change A. Cockman 1994 02 28 Printed copies are uncontrolled Page 1 of 2 Copyright 2001, Ford Global Technologies, Inc. RESISTANCE TO SCAB CORROSION Application This method is used to determine
2、the resistance of paint systems to scab corrosion under accelerated conditions. The method reproduces in the laboratory the blister type of corrosion that occurs in service following damage to a paint film. Apparatus Required Saltspray Cabinet According to ASTM B 117 Humidity Cabinet According to AS
3、TM D 2247 Scriber Carbide tipped, Model 90C Source: Aircraft Specialties Inc. Lapeer, MI 48446 U.S.A. Painted Test Panels (UMA) Size 105 x 190 mm; prepared according to FLTM BI 103-02, Section Bb. Conditioning and Test Conditions All test values indicated herein are based on material conditioned in
4、a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. Procedure 1. Age painted test panels for 72 h at 23 +/- 2 C. 2. Scribe lines, approx 150 mm in length, 20 mm apart and at le
5、ast 20 mm inboard from panels longer edge, through the paint film down to bare metal. FORD LABORATORY TEST METHOD EU-BI 053-02 Page 2 of 2 Copyright 2001, Ford Global Technologies, Inc. 3. Take 3 panels and submit them to 10 of the following test cycles; each cycle is comprised of steps a) through c
6、). a) 24 h saltspray Note: Panels are to be suspended at an angle as specified in ASTM B 117. b) 4 x 24 h humidity test comprising - 8 h at 100 % relative humidity at 38 +/- 1 C - 16 h at normal temperature and relative humidity. This is achieved by switching off the heating and opening the humidity
7、 cabinet. Notes: Panels shall neither be rinsed nor wiped off after saltspray test prior to the humidity test cycles. Panels are to be positioned so that 1) condensation occurs on test surface; 2) no contact occurs between test panels or with any other metallic materials and 3) water condensing from
8、 the roof of the cabinet or test panels does not fall onto other test panels. c) 48 h at normal room temperature and relative humidity (in the open humidity cabinet. 4. Remove panels from cabinet, rinse with water, dry and examine. Evaluation Evaluate within 2 h after completion of the 10 test cycles. Measure and report the maximum corrosion creep in millimetres, on either side of the scribed lines. Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities.
