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| RESEARCH ON SYNERGETIC EFFECT OF FOUR INHIBITORS ON COPPER IN 60%LiBr SOLUTION |
| Naibao Huang |
| 大连理工大学化工学院 |
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Abstract The conventional weight-loss tests and the electrochemical techniques were used to study the inhibition action of four inhibitors for copper in boiling deaerated 60%LiBr solution.It indicated that the corrosion rate of copper was decreased when LiOH,Na2MoO4 or BTA was added to the solution either ndividual or in different combination.The inhibition effect of combination was better than that of ndividual for LiOH not only benefited forming passive film but also accelerated the reaction of CuBTA and reduction products such as MoO2 participated in forming passive film.The optimal proportioning was added 0.10 mol/L LiOH,150 mg/L Na2MoO4 and 100 mg/L BTA to LiBr solution and the corrosion rate of copper was decreased to 39.52 μm/a.LiNO3 had little effect in inhibiting the dissolution of copper for the following reasons.The diffusion velocity of NO-3 was slower than the others.NO-3enhanced the tend ency of pitting and its reducing reaction was restrained by LiOH.The order of inhibition effect was LiOH>BTA>Na2MoO4>LiNO3.
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Received: 20 November 2002
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Corresponding Authors:
Naibao Huang
E-mail: haungnaibao@yahoo.com.cn
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