(c)
Type III – Cleaning prior to adhesive bonding.
(d)
Type IV – Cleaning prior to organic coating (including painting).
(e)
Type V – Paint removal.
(f)
Type VI – Rust removal.
(6)
For Type 1 cleaning applications, materials that meet the requirements of MIL-PRF-87937 or MIL-C-29602 may be used.
Cleaning
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B. Test Methods for determination of Acceptable Alternate Cleaners. Table 202. Test Application
TEST TEST METHOD TYPE4
I II III IV V VI
Etch Rate1 204A X X X X
Sandwich Corrosion1 204B X X X X X
Intergranular Attack 204C X X X X
Cleaning Ability 204D X X X X X
Chemical Analysis 204E X X X X X X
Hydrogen Embrittlement1 204F X X X X X
Stress Corrosion and Hydrogen Pickup of Titanium1,2 204G X X X X
Immersion Corrosion1 204H X X X X X
Effect on Painted Surfaces 204J X X X X
Acrylic Crazing Test 204K X X X X
Residue 204L X X X X
Cleaning Prior to Florescent Penetrant Inspection (FPI) 204M X
Cleaning Prior to Bonding 204N X
Cleaning Prior to Painting 204P X
Cleaning Prior to Painting (Magnesium)3 204Q X
Dissimilar Metals Corrosion 204R X
Sodium Hydroxide Base Remover 204S X
1 – Test shall be performed for aqueous and semi-aqueous cleaners (which includes all alkaline and
acidic solution). This test is not necessary for purely organic solvents. 2 – Test must be performed for cleaning products, which will be used on Titanium alloys. 3 – Test must be performed for cleaning products, which will be used on Magnesium alloys. 4 – X = Test applies to this type.
(1) Method No. 204A: Etch Rate Corrosion 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)
Immerse each of the materials (listed in Table 203) panels with at least 4 square inches (2580 millimeter squared) of total surface in the cleaner for 24 ± 0.5 hours.
(b)
The testing shall be done at the maximum operating temperature and concentration of the solution to be used during processing of parts.
(c)
The degreasing solution shall not cause etching or corrosion of the metal.
(d)
The maximum allowable weight change for each material shall be listed in Table 203.
Cleaning
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Table 203. Material Weight Change
Material Weight Change (mg/sq. in./24 Hr)
Bare aluminum (2024-T4 or T6) 2.5
Magnesium (AZ31) 5
Bare low alloy steel (AISI 4130) 7.5
Cadmium plated steel (plate in accordance with QQ-P-416, Type II, or AMS 2400) 2.5
Titanium 6 – 4 1.25
Nickel – based alloy (INCO 625 or INCO – 718) 7.5
Ferrous alloy A286 7.5
Stainless Steel Alloys 7.5
(2) Method No. 204B: Sandwich Corrosion Test 中國(guó)航空網(wǎng) www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：標(biāo)準(zhǔn)施工手冊(cè) STANDARD PRACTICES MANUAL 20-00-02/70-00-01(36)
