MIL-STD-1568D
iv
Paragraph Page
4.4 Materials and process considerations in design .......................................................................... 10
4.4.1 Selection considerations ........................................................................................................... 10
4.4.2 Guided missiles and rocket systems ........................................................................................ 11
4.4.3 Alternate manufacturing processes .......................................................................................... 11
4.5 General design requirements for corrosion prevention ............................................................... 11
4.5.1 Exclusion of rain and airborne spray ....................................................................................... 11
4.5.2 Ventilation ........................................................................................................................... 11
4.5.3 Drainage ........................................................................................................................... 11
4.5.4 Galvanically dissimilar materials ............................................................................................. 11
4.5.5 Insulation/acoustic blankets ..................................................................................................... 11
4.5.6 Nondestructive inspection (NDI) for corrosion ....................................................................... 12
4.5.6.1 NDI methodologies and techniques ...................................................................................... 12
4.6 Metallic materials........................................................................................................................ 12
4.6.1 Aluminum ........................................................................................................................... 12
4.6.1.1 Alloy selection ...................................................................................................................... 12
4.6.1.2 Aluminum alloy selection limitations ................................................................................... 14
4.6.1.3 Maximum metal removal ...................................................................................................... 14
4.6.1.4 Clad aluminum sheet............................................................................................................. 14
4.6.1.5 Compressive residual surface stress for corrosion resistance and fatigue life
improvement ........................................................................................................................... 14
4.6.1.6 Stress corrosion factor........................................................................................................... 15
4.6.1.7 Aluminum lithium (A1-Li) alloys (special considerations) .................................................. 15
4.6.2 Steels ........................................................................................................................... 15
4.6.2.1 Low alloy, high strength steels ............................................................................................. 15
4.6.2.2 Stress corrosion factors ......................................................................................................... 16
4.6.2.3 Corrosion resistant steels (CRES) ......................................................................................... 16
4.6.2.3.1 Corrosion resistant steel limitations ................................................................................... 16
4.6.2.4 Titanium ........................................................................................................................... 17
4.6.2.4.1 Surface considerations ....................................................................................................... 17
4.6.2.4.2 Fretting ........................................................................................................................... 17
4.6.2.4.3 Special precautions ............................................................................................................ 18
4.6.2.4.4 Titanium contamination ..................................................................................................... 18
4.6.2.5 Magnesium ........................................................................................................................... 18
4.6.2.6 Beryllium and aluminum-beryllium alloys ........................................................................... 18
4.6.2.7 Mercury ........................................................................................................................... 18
4.6.2.8 Depleted uranium .................................................................................................................. 18
4.6.2.9 Tin and tin alloys .................................................................................................................. 18
4.6.2.10 Bronze bearing alloys ......................................................................................................... 18
4.6.3 Organic materials ..................................................................................................................... 18
4.6.4 Composites ........................................................................................................................... 19
4.6.5 Corrosion prevention during manufacturing operations and storage ....................................... 19
4.6.6 Cleaning ........................................................................................................................... 19
4.6.7 Surface damage ........................................................................................................................ 19
4.6.8 Marking pencils ....................................................................................................................... 19
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