Halide salts
Halide salts (chlorides, fluorides, bromides, and iodides) are generally more aggressive towards aluminium than sulphates and phosphates. Their aggressiveness decreases in the order given.
1 The term "salt", used for these compounds since the 14th century, first by alchemists, stems from the analogy of their appearance and certain properties, such as their solubility in water, with "salt" NaCl.
Oxidising salts such as chlorates, persulphates, nitrates, and perchlorates generally have no action, especially if anhydrous.
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