Acid Corrosion Inhibitor are designed specifically for preventing attack due to acidic components present in the environment, on the metal components without disturbing the acidic effect or in some places even heightening the acid effect in the given application or process.
Before that we need to understand, what corrosion actually is and how acidic corrosion hampers the metal properties?
Corrosion is referred to as the deterioration of materials by chemical interaction with their environment. The term corrosion can sometimes also be applied to the degradation of concrete and wood, plastics, but generally refers to metals. Corrosion is a common phenomenon in the industrial areas and it brings about complicated circumstances in the distribution system which in turn is generally influenced by the metal used, water characteristics etc.
Commonly, it is a result from water with low pH level where H+ concentration seems to be very high to react with the electrons of the cathodes and thus, the problem of corrosion increases. The consequences of corrosion are many and varied and the effects of these on the safe, reliable and efficient operation of equipment or structures are often more serious than the simple loss of a mass of metal.
Corrosion due to acid refers to an electrochemical process which is driven by the diffusion of oxygen, moisture, and presence of acidic pollutant on the metal surfaces. Acidic Corrosion causes gradual wearing away of material mainly by acidic components. In boilers, attack due to acids can be localized at areas with high stress or can take the form of general thinning. Low pH feed water in the boilers can result into serious attack on the metal surfaces.
Acid Corrosion Inhibitor effectively prevents acid attack. Acid Corrosion Inhibitor is of the following types such as Sulfuric acid inhibitor, Sulfamic acid inhibitor, Hydrochloric acid inhibitor, citric acid inhibitor, etc.
The type and concentration of the Acid Corrosion Inhibitor to be used is obtained by the type and characteristics of metal to be protected and the conditions under which the metal is to be treated. Iron, aluminum, Steel, titanium, etc., all require alloy specific acid inhibitor formulations of corrosion preventative coatings for the best end result.