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Corrosion of C-Steel in the Red Sea: Effect of Immersion Time and Inhibitor Concentration

2015; Elsevier BV; Volume: 10; Issue: 5 Linguagem: Inglês

10.1016/s1452-3981(23)06620-8

1452-3981

Aisha H. Al-Moubaraki, Awatif A. Al-Judaibi, Maryam Asiri,

Hydrogen embrittlement and corrosion behaviors in metals

The effect of immersion time and inhibitor concentration on the corrosion of C-steel in Red Sea Water was studied using chemical and electrochemical techniques. Weight loss data revealed that the corrosion rate expressed as pit depth (μm year -1) is time dependent and obeys the power-law equation Pd = Kt n. Kinetic parameters indicate that the corrosion of C-steel occurs under mixed control of diffusion and charge transfer processes. The corrosion forms and corrosion products on C-steel were described under different conditions of immersion periods. The addition of Dill seeds aqueous extract (DSAE) reduces the corrosion rate of C-steel in Red Sea Water effectively. It was found that the inhibition efficiency increases with increasing DSAE concentration and the optimal concentration is about 10%. Electrochemical measurements showed that DSAE acts as a mixed-type inhibitor, without altering the mechanism of C-steel dissolution. Inhibition mechanism of DSAE on the C-steel surface was interpreted based on its effective constituents. The effect of DSAE concentration on microbial growth was also studied and discussed in view of its inhibitory action.