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Pyrazine derivatives can be used as inhibitors of the cold rolled steel corrosion in hydrochloric acid solution. The inhibition effect of two pyrazine derivatives of 2-aminopyrazine (AP) and 2-amino-5-bromopyrazine on the corrosion of cold rolled steel (CRS) in 1.0 M hydrochloric acid (HCl) was studied by weight loss, potentiodynamic polarization curves, and electrochemical impedance spectroscopy (EIS) methods. The results show that both AP and ABP are good inhibitors, and inhibition efficiency follows the order: ABP > AP.

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Q: What chemicals are used as inhibitors of steel in acid solution?
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