Phosphoric Acid 45% 25L

Phosphoric Acid 45% 25L

Ex Tax: £31.66

Phosphoric acid may be used to remove rust by direct application to rusted iron, steel tools, or other surfaces. The phosphoric acid changes the reddish-brown iron oxide. Multiple applications of phosphoric acid may be required to remove all rust. Rust may also be removed via phosphate conversion coating. This process can leave a black phosphate coating that provides moderate corrosion resistance.

Other applications:

Among many applications, phosphoric acid is used:

  • As a solution for anodizing
  • As an external standard for phosphorus-31 Nuclear magnetic resonance (NMR).
  • As a buffer agent in biology and chemistry; For example, a buffer for high-performance liquid chromatography.
  • As a chemical oxidizing agent for activated carbon production, as used in the Wentworth Process.[15]
  • As the electrolyte in phosphoric acid fuel cells.
  • With distilled water (2–3 drops per gallon) as an electrolyte in oxyhydrogen generators.
  • As a catalyst in the hydration of alkenes to produce alcohols, predominantly ethanol.
  • As an electrolyte in copper electropolishing for burr removal and circuit board planarization.
  • As a flux by hobbyists (such as model railroaders) as an aid to soldering.
  • In compound semiconductor processing, phosphoric acid is a common wet etching agent: for example, in combination with hydrogen peroxide and water it is used to etch InGaAs selective to InP.[16]
  • Heated in microfabrication to etch silicon nitride (Si3N4). It is highly selective in etching Si3N4 instead of SiO2, silicon dioxide.[17]
  • As a cleaner by construction trades to remove mineral deposits, cementitious smears, and hard water stains.
  • As a chelant in some household cleaners aimed at similar cleaning tasks.
  • In hydroponics pH solutions to lower the pH of nutrient solutions. While other types of acids can be used, phosphorus is a nutrient used by plants, especially during flowering, making phosphoric acid particularly desirable.
  • As a pH adjuster in cosmetics and skin-care products.[18]
  • As a dispersing agent in detergents and leather treatment.
  • As an additive to stabilize acidic aqueous solutions within a wanted and specified pH range.
  • As a sanitizing agent in the dairy, food, and brewing industries


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Product Code: AZ411-25
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