Method for preventing profiled steel plate from hydrogen fluoride corrosion and structure thereof

Abstract

The invention discloses a method for preventing profiled steel plate from hydrogen fluoride corrosion and a structure thereof. A substrate is subject to rust removing and cleaning pre-treatment, then surface treating agent is sprayed, and then phenolic resin anticorrosion paint is sprayed, drying is carried out for 24 hours, and then fluorocarbon lacquer is sprayed. The substrate of the inventionadopts galvanized steel plate with the thickness of 0.5-0.8mm, the defect that aluminium element and HF acid react as aluminium-plated zinc steel plate is adopted is overcome, and the service life ofthe substrate is prolonged. The inner layer and outer layer of the substrate adopt the composite way that epoxy anticorrosive paint primer is added with fluorocarbon finish paint, the defects that the acid corrosion resistance of monolayer protective layer is unstable and monolayer modified epoxy anticorrosion paint is not resistant to ultraviolet ray and is easy to be aged under sunlight are overcome, and fluorocarbon paint has good ultraviolet ray resistance and acid resisting capability, is difficult to be aged or invalid under sunlight and has the advantage of good combination with modified epoxy anticorrosion paint.

Description

technical field [0001] The invention relates to an anticorrosion method and structure of a profiled steel plate on a roof, in particular to a method for preventing corrosion of a profiled steel plate by hydrogen fluoride. Background technique [0002] Aluminum electrolysis is a metal smelting process, the main raw material is alumina powder, and the catalyst AlF is added 3 , cryolite (Na 3 AlF 6 ), CaF 2 As an electrolyte to produce aluminum solution by electrolysis, HF gas is inevitably produced during the production process. After the flue gas is purified, part of the HF gas that is not completely purified will be discharged into the atmosphere, and there will be residues when the electrolytic cell is opened for maintenance. 1% to 2% of HF gas in the electrolytic tank is distributed in the workshop and discharged out of the workshop through the skylight. During this process, when the HF gas encounters water vapor, it will form hydrofluoric acid particles and adhere to t...

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Problems solved by technology

[0002] Aluminum electrolysis is a metal smelting process, the main raw material is alumina powder, and the catalyst AlF is added 3 , cryolite (Na 3 AlF 6 ), CaF 2 As an electrolyte to produce aluminum solution by electrolysis, HF gas is inevitably produced during the production process. After the flue gas is purified, part of the HF gas that is not completely purified will be discharged into the atmosphere, and there will be residues when the electrolytic cell is opened for maintenance. 1% to 2% of HF gas in the electrolytic tank is distributed in the workshop and discharged out of the workshop through the skylight. During this process, when the HF gas encounters water vapor, it will form hydrofluoric acid particles and adhere to the inside and outside of the profiled steel roof. , corrode the profiled steel plate, and the ordinary profiled steel plate roof is difficult to resist the erosion of hydrofluoric acid in the sun and rain, which seriously affects the service life of the profiled steel plate roof, and even causes roof leakage, which enters the electrolytic tank and causes Hazards such as explosion of molten electrolytic aluminum

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