| A kind of controlled release solid corrosion inhibitor containing imidazoline amides was preparated,and a easy means spectrophotometry method was built determine the concentration of corrosion inhibitor.MTB was selected as chromogenic agent. With a concentration of 0.02g/L beginning test after 1.5 hour. Standard curve equation A=0.00322C(mg/L)+0.07857, correlation coefficient,r=0.99927, relative deviation sd=0.5% .Common substances and ions have litter effect on the determination with a maximal concentration: NaCl≤4.5%, Na2SO4≤2%, CaCl2≤2%, NaHCO3≤0.5%, FeCl3≤10 mg/L, PAAm≤50 mg/L .This method can use not only for solid corrosion inhibitor, but also liquid corrosion inhibitor what had tittle influenced by common ions in commonly condition. That is suitable for oil field waste water which have high salt concentration. Experiment indicate corrosion inhibitor release have two processes: surface disslove and interior diffusion. In the first phase the release rate depends on surface corrosion inhibitor dissolve and surface matrix material disslove. In the second phase corrosion inhibitor diffuse is the key.Experiment show that in the first stage when temperature rises release rate also increases, but release rate decreases as salts concentration raises.As medium flows release rate increases in the first phase but a litter change occurs in the last. The reason is medium flowing accelerate surface corrosion. Surface area and diameter have influence on release rate.In the first corrosion step release rate is quick but the last is slow ,so when design controlled release corrosion inhibitor the first phase must be considered.The combination of matrix material and corrosion inhibitor have large effect on the temperature resistant. Improvement of bonding force can increase the temperature resistant which can enlarge corrosion inhibitor application field. Modification of surface statement also can meet the requirement when corrosion inhibitor is used.
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