| 1 | MIL-HDBK-516B Airworthiness certification criteria | Department of Defense, USA | 2008 | A.4.2.19 Materials and Processes | All selected material systems and process methods must be verified for consistency with the environmental conditions and regulations used... Magnesium alloys are not suitable for saline environments and cannot be used without engineering reasons or approval |
| 2 | CS-E Specification for engine certification | European Union Aviation Safety Agency | 2003 | AMC E 130 Fireproof | Many magnesium alloys used in the manufacturing of engine components, such as magnesium chips or powder, are highly flammable when decomposed into very fine particles. Therefore, when using thin and fine magnesium alloys or magnesium alloys exposed to corrosion, friction, and high brushing speeds, the applicant should carefully evaluate the possibility of magnesium fire occurring in the entire system design and whether there are corresponding protective measures. If the assessment cannot rule out the possibility of magnesium fire, it should indicate that magnesium fire can be restricted within the engine area without causing hazardous effects |
| 3 | JSSG-2007A Joint Service specification guide engines, aircraft, turbine | Department of Defense, USA | 2007 | A.3.1.3 Materials, treatment, and parts | Magnesium should be avoided in all parts of the engine. Magnesium alloys are restricted in use because they are highly susceptible to corrosion, especially in marine environments. A small pinhole crack in the protective coating can also cause corrosion beneath the residual material of the protective coating. Naval engines with magnesium alloy accessory casings have been damaged due to corrosion. Due to the use of incompatible materials between the front frame mounting holes and the tower shaft interface, air force engines equipped with magnesium alloy casings have suffered electrical corrosion damage. The gear gearbox using magnesium alloy propellers experienced severe corrosion problems, and later aluminum alloy was used to replace magnesium alloy |
| 4 | GJB 241A-2010 General specification for aero turbojet and turbofan engines | PLA General Equipment Department, China | 2010 | 3.3.1 Materials, processes, and fasteners | When using magnesium alloys, special approval from the user department is required |
| 5 | GJB 242A-2018 General specification for aero turboprop and turboshaft engines | 2018 |
| 6 | GJB/Z 216-2004 Guide for the use of general specifications for aero turbojet and turbofan engines | PLA General Equipment Department, China | 2004 | 3.3.1.1.1 | Due to different environments, materials successfully used in air force engines may have problems when used in naval engines. Magnesium alloys are highly susceptible to corrosion, especially in marine environments, where a small pinhole in the protective layer can also cause corrosion. Both J79 and T76 engines abroad have experienced corrosion of magnesium alloy accessory casings or gear casings. Therefore, magnesium alloys should be used as appropriate with appropriate measures taken |
| 7 | GJB 2635A-2015 Design and control requirements for corrosion protection of military aircraft | 2015 | 5.2 Material selection | Among the metals used in aircraft structures, magnesium alloys have the worst corrosion resistance and are generally not suitable for structural design (especially for offshore aircraft and civil aircraft). But it can also be used in a good environment with a good protective system |
| 8 | HB 7671-2000 Design requirements for corrosion prevention of aircraft structures | Commission of Science Technology and Industry for National Defense, PRC | 2000 | 6 Corrosion resistance and limit requirements of common materials for aircraft structures |