Study on Corrosion Inhibition Mechanism of Alkali Etchant
In this paper,aluminum dissolution test is carried out on 4 groups of alkaline corrosion solutions with high concentration and low proportion alkali corrosion,low concentration and low proportion alkali corrosion,high concentration and high proportion alkali corrosion and alkali corrosion supplement after alkali corrosion failure.The influence of alkali corrosion on aluminum dissolution rate is studied by measuring the concentrations of Al3+and NaOH solution and testing the quality change of aluminum blocks.Combined with the color change of solution,the corrosion inhibition mechanism of alkali corrosion agent is analyzed.The results show that the addition of alkali etching agent can increase the upper limit of dissolved aluminum in solution,inhibit the hydrolysis of NaAlO2 in solution,and indirectly reduce the rate of dissolved aluminum in solution.The increase of aluminum consumption will lead to the failure of alkali etching agent.After the failure of corrosion inhibitor,a large number of white precipitates will be produced in the solution,the concentration of NaOH will be greatly increased,and the concentration of Al3+will be greatly reduced,which leads to the increase aluminum dissolution rate and endangers production.
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