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A preparation method of matte color superhydrophobic stainless steel based on square wave etching

A stainless steel, super-hydrophobic technology, applied in anodizing and other directions, can solve the problems of reducing the corrosion resistance of the stainless steel substrate, the negative impact of the corrosion resistance of the coloring film, and involving chemical etching liquids, etc., to achieve uniform coloring effect, highlight energy saving and environmental protection value, Ease of handling recycling

Active Publication Date: 2020-01-14
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing related patents are mainly based on the chemical etching of the stainless steel surface with a chemical etching solution to form a micro-nano rough surface structure, which is then placed in a coloring solution for coloring to obtain a colored surface and finally modified with fluorosilane to obtain a colored super-hydrophobic surface. The steps are relatively cumbersome.
Hydrochloric acid, hydrofluoric acid and other volatile acids plus corrosion accelerators such as FeCl are often used in chemical etching solutions. 3 Composition, volatile acid mist will be poisonous to the human body, and involves the problem of separate waste liquid treatment of chemical etching liquid
On the other hand, in chemical etching, the chemical corrosion liquid first chemically corrodes the oxide film on the surface of the substrate, and then further corrodes the exposed substrate. The corrosion resistance of the stainless steel substrate is reduced due to the destruction of the oxide film, and then on this basis The corrosion resistance of the resulting colored film is negatively affected

Method used

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  • A preparation method of matte color superhydrophobic stainless steel based on square wave etching
  • A preparation method of matte color superhydrophobic stainless steel based on square wave etching
  • A preparation method of matte color superhydrophobic stainless steel based on square wave etching

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Embodiment 1

[0037] A preparation method based on square wave etching of matte type super-hydrophobic colored stainless steel, comprising the following steps:

[0038] (1) Clean the stainless steel surface. The specific operation is: cut the 304 stainless steel plate sample into a shape of 1cm×5cm, put it in anhydrous ethanol and ultrasonically clean it for 5min; then put it in hot alkali (NaOH and NaOH and 3 PO 4 The compound alkaline solution, NaOH and Na in the alkaline solution 3 PO 4 The concentrations are 40g / L and 30g / L) solution, carry out alkaline washing and degreasing for 8min; finally rinse the surface of the stainless steel plate sample with deionized water.

[0039] (2) Put the cleaned stainless steel in an acid solution, and use square wave current polarization to etch the surface of the stainless steel. The specific operation is: put the stainless steel plate sample in a sulfuric acid solution with a temperature of 60 °C and a concentration of 2.5 mol / L In this method, t...

Embodiment 2

[0043] A preparation method based on square wave etching of matte type super-hydrophobic colored stainless steel, comprising the following steps:

[0044] (1) Clean the stainless steel surface. The specific operation is: cut the 304 stainless steel plate sample into a shape of 1cm×5cm, put it in anhydrous ethanol and ultrasonically clean it for 5min; then put it in hot alkali (NaOH and NaOH and 3 PO 4 The compound alkaline solution, NaOH and Na in the alkaline solution 3 PO 4 concentrations of 40g / L and 30g / L) solution, carry out alkaline washing and degreasing for 5min; finally rinse the surface of the stainless steel plate sample with deionized water.

[0045] (2) Put the cleaned stainless steel in an acid solution, and use square wave current polarization to etch the surface of the stainless steel. The specific operation is: put the stainless steel plate sample in a sulfuric acid solution with a temperature of 70 °C and a concentration of 2.5 mol / L In this method, the st...

Embodiment 3

[0049] A preparation method based on square wave etching of matte type super-hydrophobic colored stainless steel, comprising the following steps:

[0050] (1) Clean the stainless steel surface. The specific operation is: cut the 304 stainless steel plate sample into a shape of 1cm×5cm, put it in anhydrous ethanol and ultrasonically clean it for 5min; then put it in hot alkali (NaOH and NaOH and 3 PO 4 The compound alkaline solution, NaOH and Na in the alkaline solution 3 PO 4 The concentrations are 40g / L and 30g / L) solution, carry out alkaline washing and degreasing for 8min; finally rinse the surface of the stainless steel plate sample with deionized water.

[0051] (2) Place the cleaned stainless steel in an acidic solution, and use square wave current polarization to etch the surface of the stainless steel. The specific operation is: place the stainless steel plate sample in a sulfuric acid solution with a temperature of 80 °C and a concentration of 2.0 mol / L In this met...

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Abstract

A method for preparing matte color super-hydrophobic stainless steel based on square wave etching, which belongs to the technical field of metal substrate surface treatment, comprising the following steps: (1) cleaning the surface of the stainless steel; (2) immersing the cleaned stainless steel In an acidic solution, use square wave current polarization to etch the surface of stainless steel; (3) adjust the electrical signal to a square wave potential signal, and perform electrochemical square wave potential passivation coloring treatment on the etched stainless steel; The finished stainless steel is taken out from the acidic solution, and the surface is hydrophobized after cleaning to obtain a matte color super-hydrophobic stainless steel. In the same acidic system, the invention realizes the etching and coloring of stainless steel by adjusting the electrical signal without changing the solution. It is not only convenient to operate, but more importantly, the same solution is used for etching and coloring in this method, which is different from the traditional chemical etching method. Compared with replacing the liquid and then performing electrochemical coloring, the amount of waste liquid and the difficulty of waste liquid treatment are greatly reduced, which has extremely prominent energy-saving and environmental protection values.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of metal substrates, and in particular relates to a method for preparing matte colored superhydrophobic stainless steel based on square wave etching. Background technique [0002] Colored stainless steel has a good decorative effect and can be applied to large-scale architectural decoration, elevators, hardware appliances, kitchen and bathroom appliances, cabinets, advertising signs, daily necessities, etc. It can greatly increase the added value of stainless steel products and has obvious market competitive advantages. The stainless steel coloring film is an oxide film mainly composed of chromium and iron oxides. The light reflected by the surface of the oxide film and the reflected light at the metal / oxide film interface produces a light interference enhancement effect of a certain wavelength of light to present a color. However, metal oxides, the main components of the coloring film, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/06C25D11/34
CPCC25F3/06C25D11/34
Inventor 屈钧娥秦静刘战祥朱凯王海人尹习习
Owner HUBEI UNIV
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