(b)
Prepare two sandwich test specimens for each of the materials listed in Table 204 for each degreasing solution tested.
(c)
When tested in accordance with ASTM F 1110, the concentrated cleaner and a solution within the recommended concentration range shall not cause a corrosion rating greater than one on any test panel.
Table 204. Material Condition Specification
Material Condition Specification
7075 – T6 Uncoated - - -
2024 – T3 Uncoated - - -
7075 – T6 Anodized MIL – A – 8625, Type II, Class 1, or AMS 2471
2024 – T3 Anodized MIL – A – 8625, Type II, Class 1, or AMS 2471
(3) Method No. 204C: Intergranular Attack Test.
(a)
Submerse all of the materials listed in Table 203 in the solution at the maximum concentration to be used for production for 24 ± 1 hours at room temperature.
(b)
The degreasing solution shall not cause intergranular attack in excess of 0.0002 inch (0,00508 mm) or end grain pitting in excess of 0.001 inch (0,0254 mm).
Cleaning
Page 231 Apr 1/05 Copying, use or disclosure of information on this page is subject to proprietary restrictions.
20-00-02/70-00-01
(4)
Method No. 204D: Cleaning Ability Test.
(a)
Panels of 2024-T6, at least 10 inches (254 mm) by 3 inches (76,2 mm), shall be coated with the following, and shall be allowed to set for a minimum of 24 hours (except machine coolant, which shall be allowed to set for 2 hours maximum). A minimum of 2 panels shall be coated with each material.
.
Farbest 7220 Antirust oil (or other product approved in accordance with MIL-C-16173, Grade 3)
.
Machine Coolant Lubrication Oil (MIL-L-7808 or MIL-L-23699)
(b)
Clean the contaminated panels using the solution under nominal test conditions to be used in production.
(c)
Any visual surface staining or residue on the panels cleaned in the degreasing solution compared to those solvent cleaned shall be cause for rejection.
(5)
Method No. 204E: Chemical Analysis Test.
(a)
Chemical analysis procedures shall be documented for all solutions to determine solution concentration (except for solutions, which are used at 100% concentration).
(b)
The chemical analysis procedures shall be furnished to the user by the supplier and verified by the user prior to use of the solution.
(6)
Method No. 204F: Hydrogen Embrittlement Test.
NOTE: This test shall be performed for aqueous and semi-aqueous cleaners (which includes all alkaline and acidic solutions). This test is not necessary for purely organic solvents.
(a)
Unplated, notched tensile bars made from AISI 4340 in accordance with ASTM F 519, Type 1a, shall be tested in accordance with ASTM F 519 for cleaners. Degreasing solutions shall be tested undiluted and diluted to the maximum concentration to be used for production.
(b)
Treated test specimens shall meet the requirements of ASTM F 519.
(7) Method No. 204G: Stress Corrosion and Hydrogen Pickup of Titanium Test.
NOTE: This test shall be performed for aqueous and semi-aqueous cleaners (which includes all alkaline and acidic solutions). This test is not necessary for purely organic solvents.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：标准施工手册 STANDARD PRACTICES MANUAL 20-00-02/70-00-01(37)
