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Phosphoric acid is used as a chemical-cleaningagent for stainless steels. It is used in commercially availablestainless steel cleaning preparations and so if used inaccordance with the manufacturers / suppliers instructions will notetch or corrode the steel surface.
Hereof, is phosphoric acid corrosive to metals?
Phosphoric acid is incompatible with strongcaustics and readily reacts with metals to form flammablehydrogen gas. Phosphoric acid is less corrosive thansulfuric and hydrochloric acids. Pure phosphoric acid has noeffective oxidizing power and is classified as a nonoxidizingacid, much like dilute sulfuric acid.
In this regard, will phosphoric acid remove rust?
Most acids will etch metal whether they causerust or remove it. Phosphoric acid(H3PO4) is one type of acid whichremoves rust by converting it (iron III oxide) to a formwhich can be dissolved in water. Most other strong acidscause rust.
But not everything on Earth is organic. Somethings lack carbon. Such substances are commonly referred to asbeing inorganic. One of them is phosphoric acid, a corrosiveinorganic acid.