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Chlorine corrosion of crude oil has seriously affected the production of chemical plant security . Currently , control the crude chloride corrosion in a variety of ways , which add a corrosion inhibitor is the most convenient and quickest way . The Mannich base corrosion inhibitor has low toxicity , harmless, good stability and simple structure and extensive use in various fields of crude oil production . This study uses the Inhibitor rapid assessment instrument ( CMB - 4510A ) , inductive probes corrosion rate Stations ( DG -9500 ) the electrochemical workstation ( IM6ex ) and the indoor static hanging piece studied the pH value of the etching solution , temperature and Cl-concentration on the corrosion rate , while the Mannich base - based corrosion inhibitor and sodium silicate , sodium molybdate , cetyltrimethylammonium bromide bromide ( CTAB ) , sodium thiosulfate complex with and preferred . The results show that : ( 1) For 316L steel and 20 # carbon steel , when the Mannich base concentration of 200mg / L , the inhibition effect of 10 # carbon steel , when the concentration of Mannich bases 40mg / L corrosion better . N80 to 300mg / L corrosion better . (2) 20mg / L Mannich bases with 200mg / L of sodium silicate compound , of 316L steel corrosion rate reached 84% , has good corrosion synergies , and for 10 # carbon steel , 20 # carbon steel the best ratio of 1:2 and 1:3 , respectively . (3) the Mannich bases thiosulfate compound , the corrosion rate will vary with the concentration of sodium thiosulfate increases , 316L stainless steel , 10 # carbon steel , 20 # carbon steel , complex The best ratio 1:2,1:1 and 1:3 . (4) Mannich base with CTAB compound , the corrosion rate with the CTAB added significantly reduced. 316L stainless steel , when the the CTAB amount of 150mg / L , the inhibition effect . N80 when both the ratio of 1:2 , the inhibition effect . (5) Mannich base , sodium silicate , and thiosulfate sodium ternary compound of 316L stainless steel , 10 # carbon steel , 20 # carbon steel , the best ratio ratio of 1:2 : 1,1:2:1,1:1:2 .
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