A kind of boron-containing powder core wire material and coating preparation method for preparing iron-based corrosion-resistant coating by electric arc spraying

Abstract

The invention relates to a boron-contained powder core wire material for preparing an iron-based corrosion-resistant coating layer in an electric arc spraying manner and a preparation method of the iron-based corrosion-resistant coating layer, and belongs to the field of thermal spraying in materials processing engineering. A SPCC (Steel Plate Cold Commercial) steel strip is taken as the outer skin of the powder core wire material; and the filling rate of the powder core wire material is within 32% to 33%. The powder core wire material comprises the following components by mass percent: 5% to 25% of AL (aluminum), 1% to 6% of Si (silicon) and 1% to 5% of B (boron). The preparation method of the coating layer comprises the following steps of: pre-grinding the surface of a base body with 180 meshes of abrasive paper and performing a sand blasting treatment on the surface of the base body together with 60 meshes of brown fused alumina, thereby obtaining the powder core wire material; and preparing the coating layer by using an electric arc spraying process according to the spraying process parameters that the voltage ranges from 25V to 35V, the current ranges from 180A to 220A, the spraying distance ranges from 200mm to 210mm and the compression air pressure ranges from 0.4MPa to 0.6MPa. The obtained coating layer is excellent in high-temperature oxidation resistance and corrosion resistance, and can be used for obviously improving the operational reliability and prolonging the service life of 'four pipes' of a boiler so as to reduce the maintenance frequency.

Description

technical field [0001] The invention belongs to the field of thermal spraying in material processing engineering, and is a boron-containing powder core wire material prepared by an arc spraying process for an iron-based corrosion-resistant coating. The invention is mainly used in industrial fields such as high-temperature oxidation resistance and thermal corrosion resistance. Background technique [0002] In the power plant equipment, the boiler plays an important role, and together with the steam turbine and the generator, it is called the "three main engines" of the power plant. At the same time, boilers are also accident-prone equipment in power plants. Most of the unplanned shutdowns of thermal power units are caused by them, and their accidents account for more than 40% of the entire unit, accounting for the majority of all unplanned shutdowns. Among them, the failure of the "four pipes" on the heating surface of the boiler is the primary reason for the forced shutdown ...

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Problems solved by technology

[0005] At present, the coating materials used for the protection of the "four tubes" of boilers are mostly nickel-based alloy coatings, but due to their high cost, they are subject to certain restrictions in application

After searching, there is currently no patent report on the preparation of FeAlSiB corrosion-resistant coatings by arc spraying

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