THE EFFECT OF INHIBITION ON CORROSION RESISTANCE OF AISI 1020 IN SEA WATER

Mohammed Abdulaziz, Huda; Kadem Rashed, Musaab; Mahdi Thegel, Khalid

	THE EFFECT OF INHIBITION ON CORROSION RESISTANCE OF AISI 1020 IN SEA WATER
AL-TAQANI
Article 1, Volume 26, Issue 5, 2013, Pages 0-0
Authors
Huda Mohammed Abdulaziz; Musaab Kadem Rashed; Khalid Mahdi Thegel
Abstract
This paper aims to study the effect of inhibitor addition to sea water on corrosion rates of St 1020 according to AISI . Many corrosion specimens were papered from the metal of dimensions of (15153) mm according to ASTM G71-31 then Optical microscopy was used to observe the microstructure Corrosion tests were investigated by electrochemical potential state cell in 3.5% NaCl salt water (sea water) where the test specimen represents the positive electrode (anode) pole while tungsten electrode represents the cathode, the voltage was determined by open circuit and compared with the positional of metal in the electrochemical series then voltage was increased ±100 mv, at each 10mv. then record the current causes the change of voltage which will called the corrosion current then calculating corrosion rate by using Tafel equation. The inhibitors Sodium Nitrate (NaNo2) and Sodium molybdate in the concentration of 5% in addition to a synergistic inhibition of the both inhibitors in equal percentage of 2.5% for each one were added to the prepared sea water to show the effect of these inhibitors on corrosion behavior, and then corrosion rate calculated using Tafle equation. Results show that all the used inhibitors have contributed to reduce the corrosion rate while using the synergistic (blend) inhibitors gives the best results; this is due to the synergistic action of these inhibitors in reducing the anodic and catholic activities thus promoting a continuous and protective film on the alloy from corrosion.
Keywords
corrosion rate; inhibitor; carbon steel; sea water

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