Process method for preparing super-amphiphobic zinc surface

Abstract

The invention provides a process method for preparing a super-amphiphobic zinc surface. According to the process method, electrochemical etching and low-surface-energy material modification are combined; a metal zinc plate is cleaned by virtue of an organic solvent to remove oil and is mechanically polished to remove a surface oxide layer, the cleaned zinc plate is fixed on a positive electrode clamp to serve as a positive electrode, and a graphite plate with same area size with the zinc plate is fixed on a negative electrode clamp to serve as a negative electrode; a used electrochemical etching solution is a neutral salt solution with a proper concentration, constant current is introduced into two ends of the positive electrode and the negative electrode, and by controlling the machining time and machining current in the electrochemical etching process, a proper binary micro-nano coarse structure is machined on the surface of the zinc plate; after the binary micro-nano coarse structure produced by virtue of electrochemical etching is modified by virtue of the low-surface-energy material, the super-amphiphobic zinc surface can be obtained. The process method has the advantages of simplicity in operation, high efficiency, good environmental friendliness, low cost and the like and is expected to be applied to large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of metal surface treatment and relates to a process method for preparing a super amphiphobic zinc surface. Background technique [0002] Metal zinc and its alloys, as important engineering materials, play an important role in daily life and industrial and agricultural production, and have been used in iron and steel, metallurgy, machinery, electrical, chemical, military and pharmaceutical fields. At present, among many metals, zinc is second only to iron, aluminum and copper in consumption worldwide. The main application of zinc is as a sacrificial anode to protect weakly reducing metals from corrosion. Therefore, if the corrosion resistance of anode zinc is improved to a certain extent, the service life of the protected metal will also increase. At present, various methods have been used to improve the corrosion resistance of zinc. Among them, the researchers found that the superamphiphobic zinc surface with both o...

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Problems solved by technology

[0003] At present, there are many methods for preparing superhydrophobic surfaces on zinc and zinc alloy substrates, but there are few reports on the preparation of zinc-based superamphiphobic surfaces by efficient, cheap and environmentally friendly methods.

In 2005, Qian et al prepared superhydrophobic surfaces on metal copper, zinc and aluminum substrates by chemical etching and modification of fluorosilane (Qian, B.T.; Shen, Z.Q.Langmuir 2005, 21, 9007-9009). The processing efficiency is high, but due to the use of strong acid, pungent odor is produced during the reaction process, which is more harmful to operators and the environment

In 2007, Guo et al. prepared a superhydrophobic zinc oxide coating with a nano-sized surface microstructure by using a combination of hydrothermal method and octadecyl mercaptan modification (Guo, M.; Diao, P.; Cai, S.M. Thin Solid Films 2007,515,7162-7166), the hydrophobicity of the obtained surface is relatively high, but the solution used in this method has certain toxicity, which will cause certain harm to the operator and the environment

In 2008, Meng et al. used a one-step chemical immersion method to prepare a superamphiphobic surface on a zinc substrate (Meng, H.F.; Wang, S.T.; Xi, J.M.; Tang, Z.Y.; Jiang, L.J.Phys.Chem.C 2008,112,11454 -11458), this method is simple to operate, but requires a reaction time of up to 10 days

In 2009, Liu et al. used one-step solution immersion method to prepare superhydrophobic surfaces on zinc, steel and silicon substrates (Liu, H.Q.; Szunerits, S.; Pisarek, M.; Xu, W.G.; Boukherroub, R.ACS Applied Materials & Interfaces , 2009,9,2086-2091), this method saves the step of low surface energy treatment, but the processing efficiency is low, and it needs to react for 1-3 days

The processing efficiency of these two methods is relatively high, but the reagents required are expensive and the resulting superhydrophobic surfaces have poor mechanical properties

In 2015, Canadian scientists Brassard et al. used electrochemical deposition to deposit a zinc film on the steel surface, and then modified the surface with low surface energy to show superhydrophobicity (Brassard, J.D.; Sarkar, D.K.; Perron, J.Audibert-Hayet, A.; Melot, D.Journal of Colloid and Interface Science 2015, 447, 240-247), the prepared superhydrophobic surface has good anti-icing and anti-corrosion performance, but the superhydrophobic zinc film prepared by this method and the matrix Poor binding

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