Study On Fluoride-free Preparation And Properties Of Super-hydrophobic Surface Of Alloy Steel

In today's production and life,alloy steel contains various excellent properties,such as good comprehensive mechanical properties,heat resistance,acid resistance and corrosion resistance.At the same time,due to the large amount of steel used in automobile body materials,in order to achieve lightweight vehicles and reduce fuel consumption,the application of alloy steel to the automotive field has become an indispensable item.When facing different application environments,in order to improve the performance of the alloy steel surface,the surface treatment technology is used to construct a super-hydrophobic structure on the alloy steel surface,which makes the alloy steel surface have self-cleaning,waterproof,anti-corrosion and other properties,which enhances the application range of the alloy steel in the body material.At present,there are various methods for preparing superhydrophobic surface materials.However,most of them have the disadvantages of harsh preparation conditions,special processing equipment or complicated technological processes,and the rough surface usually affects the performance of the materials.They have not made super-hydrophobic materials widely used.Based on these questions,in this paper,a combination of chemical etching and high-temperature drying is used to successfully prepare a super-hydrophobic effect on the surface of the alloy steel substrate without adding any low surface energy organics.The formation mechanism,super-hydrophobic principle and application of super-hydrophobic surface were analyzed and studied.The main discussions are as follows:(1)The super-hydrophobic surface of the micro-nano composite structure is constructed on the surface of the alloy steel substrate by a method combining chemical etching and hightemperature drying.The equipment and experimental procedures involved in using this method are relatively simple and do not require modification using low surface energy organic substances.This method can obtain a super-hydrophobic surface with a water contact angle of 167.5 ° ± 2.7 ° and a rolling angle of 5.5 ° ± 2.0 °.The characterization of superhydrophobic surface and the analysis and research of influencing factors(Including the etching time in the mixed solution,the temperature of the high temperature drying process and the time of the high temperature drying process)illustrate the important role of micro-nano composite structures in the process of forming superhydrophobic experiments.(2)Characterization and analysis of the superhydrophobic surface wettability of the prepared sample surface.The influence of various factors on the experimental results during the preparation of the super-hydrophobic surface of the alloy steel substrate was discussed,including solution etching time,high temperature drying time and high temperature drying temperature.The main analytical instruments used are contact angle measuring instrument and rolling angle measuring instrument,which are used to measure the size of contact angle and rolling angle;The microscopic morphology,elemental composition and crystal composition of the prepared sample surface were analyzed,and the formation mechanism of superhydrophobic surface was discussed,analytical instruments such as SEM,EDS and XRD were mainly used to test the superhydrophobic surface of the alloy steel substrate.(3)The design performance test experiment mainly tests the self-cleaning performance,durability,corrosion resistance and friction resistance of the surface of the super-hydrophobic sample.Finally,based on the analysis of all the performance test experiment results,it is found that the surface of the alloy steel superhydrophobic sample prepared by the experiment has good self-cleaning performance,durability,corrosion resistance and friction resistance.