Fluorine magnesium alloys

Hydrofluoric acids - [ALUMINUMAND ALUMINUM ALLOYS] (Vol 2) - [ALUMINUMCOMPOUNDS - INTRODUCTION] (Vol2) - [FINECHEMICALS - STANDARDS] (Vol 10) -effect on glass [GLASS] (Vol 12) -magnesium reaction [MAGNESIUM AND MAGNESIUM ALLOYS] (Vol 15) -reaction with fluorine [FLUORINE] (Vol 11) - [COAL] (Vol 6)... 

R.A. Jarjis, On the determination of fluorine concentration profiles in magnesium alloy scales using the 19F(p,ay)160 reaction, Nucl. Instr. Meth. B154 (1978) 383-387. 

Figure 2.11 Electrochemical impedance spectra of bare metal, fluorinated polyoxadiazole (POD-6F) and bilayer polyoxadiazole (DPE-HF) coated AZ31 magnesium alloy.

Question by R. W. Flournoy, Reynolds Metals Co. What filler rods or wire are used for welding 6061 and 356 alloys used for equipment handling liquid fluorine Have the high strength aluminum—magnesium alloys such as 5083, 5052, etc., been used for handling liquid fluorine ... 

Answer by Author In general, under natural conditions. Mg alloys are compatible in all cryogenic liquids. However, under more violent conditions, such as magnesium chips under impact or very heavy friction wear, magnesium alloys may become incompatible in liquid oxygen or fluorine. 

When constructing electrolyzers for this process it is rather difficult to find suitable materials which can resist the effects of fluorine as it attacks most metals even at normal temperature fortunately continuous fluoride coatings are formed on the surface of some metals which protects them against further corrosion at least to a certain extent. Such metals are iron, nickel, Monel metal, aluminium and its alloys, magnesium and especially electron one of its alloys. However, the protective films are only stable at lower temperatures. At elevated temperatures a violent reaction proceeds between the fluorine and the metal. Monel metal and copper have relatively the best resistance against fluorine at elevated temperatures. These metals, therefore, were widely used to construct electrolyzers. In more recent designs, copper was replaced by steel or electron. 

CBr4 Noncombustible solid. Violent reaction with fluorine, hexylcyclo-hexyldilead, oxygen, potassium, potassium acetylene-1,2-dioxide, sodium azide, uranium(III) hydride. Mixtures with finely divided aluminum, lithium, magnesium, potassium-sodium alloy, titanium, zinc can form a friction- or shock-sensitive explosive material. Incompatible with decaborane. Attacks active metals. 

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