Metal anticorrosive coating layer for pressure container under working condition of high salt content and preparation method thereof

Abstract

The invention discloses a metal anticorrosive coating layer for a pressure container under a working condition of high salt content and a preparation method thereof. Metal powder adopted by the anticorrosive coating layer comprises 64-66% of Ni, 10-12% of Cr, 0-0.1% of C, 0-0.01% of S, 0-0.01% of P, 16-18% of Fe, 2.0-3.5% of B and Si. The metal anticorrosive coating layer has the following benefits: the coating layer material can satisfy the requirement on the material self-fluxing nature from the inductive brazing remelting; the metal anticorrosive coating layer is prepared through a novel process of thermal spraying and inductive brazing remelting, so that the corrosion requirement under the working condition of high-salt content natural gas is satisfied, the bonding strength between the coating layer and a substrate is largely improved, and the porosity of the coating layer is reduced; and the metal anticorrosive coating layer is a novel economic anticorrosive material capable of resisting the working conditions of high salt content and strong corrosion and capable of being popularized in the pressure container.

Description

technical field [0001] The invention relates to a metal anticorrosion coating for pressure vessels under high salt corrosion conditions and a preparation method thereof. Background technique [0002] Existing metal thermal spraying materials are widely used as metal coatings with anti-corrosion and wear-resistant functions on structural parts such as steel structures and impellers; The disadvantages such as low metal bonding strength (generally below 80MPa) limit the popularization and application of pressure vessels. Under the conditions of high salt content and extremely severe corrosion, the use of composite plate materials or pure materials with better corrosion resistance and expensive price for medium-thick-walled vessels is limited by the manufacturing process and economy. Therefore, there is an urgent need to find an economical corrosion-resistant coating and its preparation method that can withstand high salt and strong corrosion conditions and can be widely used o...

AI Technical Summary

Problems solved by technology

[0002] Existing metal thermal spraying materials are widely used as metal coatings with anti-corrosion and wear-resistant functions on structural parts such as steel structures and impellers; The disadvantages such as low metal bonding strength (generally below 80MPa) limit the popularization and application of pressure vessels.

Under the extremely severe corrosion conditions with high salt content, the use of composite plate materials or pure materials with better corrosion resistance and expensive price for medium-thick-walled vessels is limited by the manufacturing process and economy