Method for preparing NiP/TiO2 anticorrosion composite film on surface of carbon steel

Abstract

The invention discloses a method for preparing a NiP / TiO2 anticorrosion composite film on the surface of carbon steel, which comprises: firstly, chemically plating a NiP layer on the surface of the carbon steel as a transitional layer; and secondly, preparing the anticorrosion NiP / TiO2 composite film on the surface of the carbon steel by an anodic electrodeposition process. By using the NiP layeras the transitional layer, a breakthrough is made in the conventional method for preparing a TiO2 thin film by a sol-gel process by preparing by TiO2 thin film on the surface, on which the NiP is chemically plated, by the anodic electrodeposition process, and the NiP plating is anticorrosion alloy plating and solves the problem of bonding between subsequent plating and a substrate. The prepared NiP / TiO2 composite film can isolate outside media and protect the metal substrate. In addition, the prepared NiP / TiO2 composite film, when placed in light, can play a role in photogenerated cathodic protection of the metal substrate. The two effects cooperate to improve the anticorrosion performance of the metal in a severe environment greatly.

Description

technical field [0001] The invention relates to the field of corrosion and protection of metal materials, and more specifically relates to a method for preparing a corrosion-resistant composite film on the surface of carbon steel. Background technique [0002] Among many semiconductor materials, titanium dioxide has been widely studied for its excellent photocatalytic and photoelectric properties. In recent years, nano-TiO 2 With its unique photoresponse characteristics, the material has been widely used in air purification and organic wastewater treatment. Currently, TiO 2 The corrosion resistance and photoelectric properties of thin films have attracted more and more scholars' favor, and more and more TiO 2 Thin films act as protective coatings on metal surfaces. Powdered TiO 2 、TiO 2 Nanotubes and TiO 2 Nano-films are commonly used in several forms. In practical applications, due to the powdery nano-TiO 2 Difficult to apply directly, and easy to reunite, easy to in...

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Problems solved by technology

Powdered TiO 2 、TiO 2 Nanotubes and TiO 2 Nano-films are commonly used in several forms. In practical applications, due to the powdery nano-TiO 2 Difficult to apply directly, easy to reunite, easy to inactivate, and difficult to recycle, thus greatly affecting its promotion and use

However, there are still differences in the formation mechanism and composition of titanium dioxide nanotubes, and no single-layer titanium dioxide nanotubes have been reported so far; in terms of synthesis methods, the template method, anodic oxidation method, and concentrated alkali hydrothermal synthesis method have their own advantages. and insufficient; and the doping space of titanium dioxide nanotubes is limited, and the doping is limited to a few noble metals and a very small amount of non-metals

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