Powder-core wire for preparing iron-base corrosion-resistant coating by arc spraying and preparation method of coating

Abstract

The invention relates to a powder-core wire for preparing an iron-base corrosion-resistant coating by arc spraying and a preparation method of the coating, belonging to the field of hot spraying in material processing engineering. The band used by the powder-core wire sheath is a stainless steel band, and the fill rate of the powder-core wire is 32-33%. The powder-core wire comprises 20-26 wt.% of Cr, 5-13 wt.% of B and 4-13 wt.% of Al. The preparation method of the coating comprises the following steps: pre-grinding a base surface with 180-mesh sand paper, and carrying out grit blasting with 60-mesh brown fused alumina; and obtaining a powder-core wire, and preparing the coating by an arc spraying technique: the voltage is 25-35V, the current is 180-220A, the spraying distance is 200-210mm, and the compressed air pressure is 0.4-0.6 MPa. The coating has the advantages of favorable high-temperature oxidation resistance, favorable corrosion resistance, and high bonding strength with the base, can obviously enhance the operational reliability and service life of the boiler four pipes, and can lower the frequency of maintenance.

Description

technical field [0001] The invention belongs to the field of thermal spraying in material processing engineering, and is a 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 of the boiler. W...

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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 FeCrAlB corrosion-resistant coatings by arc spraying

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