EFFECTTIVE FRAMEWORK OF PHTHALIC ANHYDRIDE AS CORROSION INHIBITOR OF MILD STEEL IN 1M SULPHURIC ACID SOLUTION

A refined metal is transformed by corrosion into a more chemically stable state, such as its oxide, hydroxide, or sulphide. Corrosion is a very natural phenomena and a severe concern in the worldwide community. Organic chemicals with nitrogen, Sulphur, oxygen, and phosphorus in their functional groups are the most well-known corrosion inhibitors. The adsorption of organic functional groups via lone pairs of electrons on the metal surfaces has been hypothesized as the mechanism for these compounds. From the standpoints of corrosion and building materials, sulfuric acid is the most challenging of the common acids to manage. The majority of popular metals and alloys are severely corroded by the acid. In the experiment, we examined 7 different PPM solutions reacting for 24 and 48 hours, ranging from 10-500 PPM. The after-inhibition efficacy at 500 ppm inhibitory concentration was about 98 percent, and the inhibition efficiency increases with increasing Phthalic Anhydride concentration.