| This paper studied the corrosion velocity and corrosion inhibition efficiency of brass in 10% mud acid(7%HCl+3%HF) with a few of compounds by weight-loss method, then some kinds of compounds with certain corrosion inhibition effect have been got in in mud acid solution.In these compounds benzalkonium bromide,sodium dodecyl benzene sulfonate and diethylene tramine were selected as research object. Their corrosion inhibition action of brass in 10% mud acid was studied with different temperatures in mud acid solution by adsorption theory and electrochemical polarization-curve method, the mechanism of corrosion inhibition action was analyzed. The result shows that the single molecule layer of benzalkonium bromide,sodium dodecyl benzene sulfonate and diethylene tramine adsorbed on the surface of the brass and followed Langmuir isothermal equation. The adsorption procedure of benzalkonium bromide and sodium dodecyl benzene sulfonate was exothermic reaction, the adsorption ability and corrosion inhibition efficiency decreased with increasing in temperature. But the adsorption procedure of the cetyl diethylene tramine was a heat-absorbing reaction. the adsorption ability and corrosion inhibition efficiency decreased when temperature increased. They are all mixed type inhibitor. The corrosion current was decreased by them in different degree.A composite and excellent corrosion inhibitor was composed by orthogonal method. The corrosion inhibition action of this composite corrosion inhibitor has been evaluated by using weight-loss method, electrochemical polarization-curve method and scanning electron microscopy techniques. The corrosion rate of brass in mud acid has been determined with different concentration of mud acid, different temperature and different time. The SEM photos indicated that no signal of was found under different corrosion condition. It shows that the composite corrosion inhibitor is an excellent corrosion inhibitor for brass in mud solution.
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