The Preparation And Characterization Of Three Kinds Of Superhydrophobic Materials And Their New Methods On Corrosion Inhibition

Marine corrosion is a globally troublesome problem that causes considerable loss annually.This natural phenomenon is commonly defined as the deterioration of active metals because of spontaneous reaction with the corrosive substance.The water phase is the solvent and medium for the corrosive species and plays an essential and critical role during the whole destructing process.Because of the hydrophobicity,the superhydrophobic material can block the contact between the substrate and the corrosive medium,so it is a very good corrosion inhibiting material.It has been several decades since the use of superhydrophobic materials for corrosion inhibition,but there are still many problems need to be further explored and studied.for example: the general method of preparation of superhydrophobic materials is too complex,time-consuming,easy to failure,etc..In order to solve these problems,this paper used the electrochemical deposition method,one step immersion method and the atmospheric pressure plasma jet method to prepare the superhydrophobic materials,which were used in corrosion inhibition.The main contents and results are as follows:1.Superhydrophobic coatings with micro nano rough structure were prepared on the surface of the copper substrate by a simple electrodeposition method.The preparation conditions were optimized.It was found that the deposition of 12 h at the 30 V voltage is the best preparation condition.Under these conditions,the superhydrophobic surface has a contact angle of 156°.The effect of the surface on corrosion inhibition was studied.Potentiodynamic polarization curves and EIS measurements were performed in 3.5% NaCl solution.The results show that the superhydrophobic surface has excellent corrosion resistance and the corrosion inhibition efficiency reachs 99.9 %.2.The structure of long chain silane was attached to the skeleton of sponge by immersion method and the superhydrophobic sponge was successfully prepared.The contact angle is 168°.The superhydrophobic sponge were used in corrosion inhibition,and ventilating in the superhydrophobic sponge for further protection of metal.Low alloy steel was used to characterize the corrosion inhibition ability of superhydrophobic sponge.Macroscopic observation,SEM and EDS test were carried out on steel coupon under various conditions.The open circuit potential,potentiodynamic polarization and impedance of steel coupon were determined.The humidity on the surface of steel coupon was monitored in situ.The results show that the ventilation method can effectively inhibit the corrosion of metal.3.Another superhydrophobic sponge material was prepared by atmospheric pressure plasma jet(APPJ)method,and this material's contact angle could reach 163°.Scanning electron microscope(SEM)was used to observe the original sponge and the modified sponge.The results show that the structure of modified superhydrophobic sponge has a lot of snowflake like structure,which greatly increases the surface roughness of the sponge skeleton.The composition of superhydrophobic sponge surface was tested by EDS,and the content of each element was analyzed.It was found that the surface of modified sponge was mainly SiOx.The superhydrophobic sponge material was applied in the field of corrosion inhibition,and the anti-corrosion ability of the superhydrophobic sponge was supplemented by heating method.The macroscopic observation,SEM and EDS tests were carried out on steel coupon under various conditions.The results show that the method of superhydrophobic sponge heating can inhibit the corrosion of metal.