Definition - What does Anionic mean?
Anionic refers to chemical substances that possess a negatively charged ion. Anionic substances and solutions do not ionize in aqueous solutions; as such, they are effectively used to create corrosion-inhibiting surfactants.
Corrosionpedia explains Anionic
Anionic solutions are used for the production of surfactants. Surfactants adhere to metal surfaces and prevent the penetration of water and other corrosion-causing agents. The surfactants act as inhibitors by changing the interfacial properties of the metal, thus adjusting rates of physical and chemical adsorption.