C, Silicon Si, and Boron

Carbon in the form of coal, soot and powder has no action on aluminium. Aluminium equipment is widely used in coal mining, for two reasons aluminium resists corrosion well in this particular environment comprising a high level of humidity and carbon dust, 

In the presence of water or humidity, contact between graphite and aluminium can lead to strong galvanic corrosion of aluminium (see Section B.3.8). 

Calcium carbide CaC2 has no action on aluminium. Sludge residues resulting from the decomposition of carbide by water during the preparation of acetylene mainly consist in lime that leads to a superficial pitting attack of the metal. 

Silicon and boron have no action on aluminium at any temperature, even in the presence of humidity. 

Unlike other common metals, aluminium does not react with sulphur to yield sulphides, even at high temperatures. Aluminium is thus inert in contact with sulphiu over a wide range of temperatures, whether solid or liquid (melting point 119 °C). Tests have confirmed that aluminium is totally inert in contact with vapours of boiling sulphiu at 444 °C. 

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