CORROSION BEHAVIOR OF GRAY CAST IRON IN SEA WATER AT DIFFERENT PARAMETERS

Sabti Mohammed, Nisreen; Ismail Tayh, Wisam

	CORROSION BEHAVIOR OF GRAY CAST IRON IN SEA WATER AT DIFFERENT PARAMETERS
AL-TAQANI
Article 1, Volume 30, Issue 6, 2017, Pages 0-0
Authors
Nisreen Sabti Mohammed; Wisam Ismail Tayh
Abstract
The corrosion behavior of gray cast iron in sea water at diverse temperatures (25, 50 and 75) °C and diverse velocity (1, 2 and 3) m/min was actualized. Many specimens were prepared in dimensions of (1.5* 1.5 * 0.3) cm according to ASTM G7-1-31then electrochemical potential state cell was used for corrosion tests, the positive electrode (anode) was signifies the test specimen while the cathode was made from tungsten metals, the voltage was determined by open circuit and associate with the positional of metal in the electrochemical series then voltage was increased + 100 mV, at each 10-mV increasing in the current and determine the corrosion current Sea water (3.5% NaCl in 1 litter distill water) temperature altered after each test then varying the velocity after each test (1, 2 and 3) m/min at stable temperature sea water 25 oC, calculating corrosion rate by using Tafel equation. Another test implemented such as microstructure examination using optical microscope. The results show that the corrosion rate increased with increasing solution temperature this is because of the prevention of oxygen from dissolving in water while the corrosion rate decreases by increasing velocity of sea water. Since the movement of the liquid avoids the formation of sums and ions gathering on cathode electrode where corrosion can simply improve.
Keywords
gray cast iron; corrosion; media temperature; media velocity

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