A stainless steel high-temperature molten chloride corrosion protection method

By depositing a molybdenum coating on the surface of stainless steel and performing vacuum annealing, the corrosion problem of stainless steel in high-temperature molten chloride environment was solved, achieving effective protection and promoting its application in solar thermal power generation systems.

CN117467957BActive Publication Date: 2026-05-01SOUTHWEAT UNIV OF SCI & TECH
3 Cites 0 Cited by

Patent Information

Application Number
CN202311462817.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-06
Publication Date
2026-05-01
Estimated Expiration
2043-11-06

AI Technical Summary

Technical Problem

Existing technologies are insufficient to effectively protect stainless steel from corrosion in high-temperature molten chloride environments, especially in solar thermal power generation systems. Traditional methods are complex, costly, and have unpredictable coating adhesion, while nickel-based alloys are expensive.

Method used

A molybdenum coating was deposited on the surface of stainless steel and then subjected to vacuum annealing. Specifically, the molybdenum coating was deposited using magnetron sputtering technology with a thickness of 1.5 μm, an annealing temperature of 800℃, and a time of 1-10 hours. This process was applied to 304 stainless steel.

Benefits of technology

Molybdenum coatings exhibit excellent corrosion resistance in high-temperature molten chloride salts, providing significant protection and promoting the application of stainless steel in solar thermal power plants.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The application discloses a stainless steel high-temperature molten chloride corrosion resistance protection method, which comprises the following steps: depositing a molybdenum coating on the surface of the stainless steel; and performing vacuum annealing treatment on the stainless steel with the molybdenum coating deposited on the surface, so as to realize high-temperature molten chloride corrosion resistance protection of the stainless steel. The application adopts a magnetron sputtering technology to deposit a pure molybdenum coating on 304 stainless steel, the thickness of the coating is 1.5 microns, and vacuum annealing is performed at 800 DEG C for 3 hours. After the molybdenum coating 304 stainless steel subjected to vacuum annealing treatment is corroded in high-temperature molten chloride at 700 DEG C for 800 hours, the sample still maintains good stability. Compared with the stainless steel without the molybdenum coating, the stainless steel with the molybdenum coating but without annealing treatment, or the stainless steel with the molybdenum coating and subjected to different annealing time at the same temperature, the molybdenum coating subjected to vacuum annealing at 800 DEG C for 3 hours and then corroded in high-temperature molten chloride at 700 DEG C for 800 hours still maintains stability, can effectively protect the 304 stainless steel, and promotes the application of the 304 stainless steel as a structural material in the next generation of solar thermal power stations.
Need to check novelty before this filing date? Find Prior Art