Marine-corrosion/hot-corrosion-resistant composite coating and preparation method thereof

Abstract

The invention discloses a marine-corrosion / hot-corrosion-resistant composite coating and a preparation method thereof, belonging to the technical field of metal surface protection. A novel FeCrAlRe hot-corrosion-resistant powder core wire material is prepared by coating mixed powder, containing Cr powder, Al powder and the like, on a carbon steel band. A ZnAlMgRe powder core wire material is prepared by coating mixed powder, containing Al, Mg, Zn and Re, on a Zn-base alloy band. The preparation method of the composite coating comprises the following steps: spraying the FeCrAlRe powder core wire material by using a high-speed arc spraying device to form an alloy coating on a pretreated steel base surface, and spraying a ZnAlMgRe coating to form a double-layer composite structure protective coating. The prepared coating can resist hot corrosion, and has excellent corrosion resistance in a marine high-humidity high-salt-mist environment.

Description

Technical field

[0001] The invention relates to a FeCrAlRE+ZnAlMgRE double-layer composite coating and a preparation method thereof, and is mainly suitable for corrosion protection of steel structure parts under severe conditions of thermal corrosion under the marine environment, and belongs to the technical field of metal anticorrosive materials. Background technique

[0002] Corrosion of equipment steel structure in marine climate, especially in sea water, high temperature, high humidity, high salt spray, high sunshine and other harsh conditions, has become increasingly prominent, and damage caused by corrosion has occurred from time to time. The use of zinc-aluminum alloy anticorrosive coatings is one of the effective methods for steel structure corrosion protection, such as the literature "Dong Lixian, Wang Yong, Li Xuesheng. The corrosion resistance of arc sprayed aluminum and aluminum-zinc coatings in dynamic corrosive media. Research on petroleum Journal of the University,...

Examples

Embodiment 1

[0041] Take 500g of aluminum powder, 500g of chromium powder and 25g of composite rare earth nickel powder and mix it evenly. Use 3245g of 08F high-quality low-carbon steel strip with a specification of 10mm×0.4mm (width×thickness), and pass through the multifunctional powder-cored wire forming test device. A sequence of rolling, powder filling, sealing, and wire drawing reduction is a sequence of processes to produce FeCrAlRE finished wire. The mass percentage of alloying elements in 08F low carbon steel strip is 0.05~0.11%C, 0.25~0.5%Mn, ≤0.03% Si, ≤0.035%P, ≤0.035%S, ≤0.25%Ni, ≤0.10%Cr, ≤0.25%Cu. The powder core filling rate of the wire is 24%, and the diameter of the wire is 2 mm.

[0042] Take 250g of aluminum-magnesium alloy powder with 50% by mass of magnesium, 250g of aluminum powder and 50g of composite rare-earth nickel powder and mix them uniformly, and use a Zn-Al alloy strip (containing 2.0% Al) with a specification of 10mm×0.5mm (width×thickness) 2500g, through the...

Embodiment 2

[0047] Take 790g aluminum powder, 200g chromium powder and a small amount of 10g composite rare earth nickel powder and mix them evenly, using 3000g 10F high-quality low-carbon steel strip with a specification of 10mm×0.3mm (width×thickness), and pass through the multifunctional powder core wire forming test device Strip rolling, powder filling, sealing, wire drawing and diameter reduction are a sequence of processes to obtain FeCrAlRE finished wire. The mass percentage of alloying elements in 10F low carbon steel strip is 0.07~0.14%C, 0.25~0.5%Mn, ≤0.07%Si, ≤0.035%P, ≤0.035%S, ≤0.25%Ni, ≤0.15%Cr, ≤ 0.25% Cu. The powder core filling rate of the wire is controlled to 25%, and the diameter of the wire is 2mm.

[0048] Take 80g of aluminum-magnesium alloy powder containing 50% by mass of magnesium, 760g of aluminum powder and 10g of composite rare-earth nickel powder, and mix them uniformly, and use a Zn-Al alloy strip (containing 0.5% Al) with a specification of 10mm×0.5mm (width×...

Embodiment 3

[0052] Take 500g of aluminum powder, 375g of chromium powder and 125g of composite rare earth nickel powder and mix uniformly. Use 08F high-quality low-carbon steel strip with a specification of 10mm×0.4mm (width×thickness), and pass through a multifunctional powder-cored wire forming test device. , Powder filling, sealing, wire drawing and reducing diameter are a sequence of processes to produce FeCrAlRE finished wire. The powder core filling rate of the wire is controlled to 20%, and the wire diameter is 2mm.

[0053] Take 600g of aluminum-magnesium alloy powder containing 50% by mass of magnesium, 200g of aluminum powder and 250g of composite rare-earth nickel powder and mix them uniformly, and use a Zn-Al alloy strip (containing 1% Al) with a specification of 10mm×0.5mm (width×thickness) 3950g, through the multifunctional powder core wire forming test device, through a sequence of rolling, charging, sealing, wire drawing and reducing diameter, the finished wire is obtained. Th...

Technical field

[0001] The invention relates to a FeCrAlRE+ZnAlMgRE double-layer composite coating and a preparation method thereof, and is mainly suitable for corrosion protection of steel structure parts under severe conditions of thermal corrosion under the marine environment, and belongs to the technical field of metal anticorrosive materials. Background technique

[0002] Corrosion of equipment steel structure in marine climate, especially in sea water, high temperature, high humidity, high salt spray, high sunshine and other harsh conditions, has become increasingly prominent, and damage caused by corrosion has occurred from time to time. The use of zinc-aluminum alloy anticorrosive coatings is one of the effective methods for steel structure corrosion protection, such as the literature "Dong Lixian, Wang Yong, Li Xuesheng. The corrosion resistance of arc sprayed aluminum and aluminum-zinc coatings in dynamic corrosive media. Research on petroleum Journal of the University,...

Examples

Embodiment 1

[0041] Take 500g of aluminum powder, 500g of chromium powder and 25g of composite rare earth nickel powder and mix it evenly. Use 3245g of 08F high-quality low-carbon steel strip with a specification of 10mm×0.4mm (width×thickness), and pass through the multifunctional powder-cored wire forming test device. A sequence of rolling, powder filling, sealing, and wire drawing reduction is a sequence of processes to produce FeCrAlRE finished wire. The mass percentage of alloying elements in 08F low carbon steel strip is 0.05~0.11%C, 0.25~0.5%Mn, ≤0.03% Si, ≤0.035%P, ≤0.035%S, ≤0.25%Ni, ≤0.10%Cr, ≤0.25%Cu. The powder core filling rate of the wire is 24%, and the diameter of the wire is 2 mm.

[0042] Take 250g of aluminum-magnesium alloy powder with 50% by mass of magnesium, 250g of aluminum powder and 50g of composite rare-earth nickel powder and mix them uniformly, and use a Zn-Al alloy strip (containing 2.0% Al) with a specification of 10mm×0.5mm (width×thickness) 2500g, through the...

Embodiment 2

[0047] Take 790g aluminum powder, 200g chromium powder and a small amount of 10g composite rare earth nickel powder and mix them evenly, using 3000g 10F high-quality low-carbon steel strip with a specification of 10mm×0.3mm (width×thickness), and pass through the multifunctional powder core wire forming test device Strip rolling, powder filling, sealing, wire drawing and diameter reduction are a sequence of processes to obtain FeCrAlRE finished wire. The mass percentage of alloying elements in 10F low carbon steel strip is 0.07~0.14%C, 0.25~0.5%Mn, ≤0.07%Si, ≤0.035%P, ≤0.035%S, ≤0.25%Ni, ≤0.15%Cr, ≤ 0.25% Cu. The powder core filling rate of the wire is controlled to 25%, and the diameter of the wire is 2mm.

[0048] Take 80g of aluminum-magnesium alloy powder containing 50% by mass of magnesium, 760g of aluminum powder and 10g of composite rare-earth nickel powder, and mix them uniformly, and use a Zn-Al alloy strip (containing 0.5% Al) with a specification of 10mm×0.5mm (width×...

Embodiment 3

[0052] Take 500g of aluminum powder, 375g of chromium powder and 125g of composite rare earth nickel powder and mix uniformly. Use 08F high-quality low-carbon steel strip with a specification of 10mm×0.4mm (width×thickness), and pass through a multifunctional powder-cored wire forming test device. , Powder filling, sealing, wire drawing and reducing diameter are a sequence of processes to produce FeCrAlRE finished wire. The powder core filling rate of the wire is controlled to 20%, and the wire diameter is 2mm.

[0053] Take 600g of aluminum-magnesium alloy powder containing 50% by mass of magnesium, 200g of aluminum powder and 250g of composite rare-earth nickel powder and mix them uniformly, and use a Zn-Al alloy strip (containing 1% Al) with a specification of 10mm×0.5mm (width×thickness) 3950g, through the multifunctional powder core wire forming test device, through a sequence of rolling, charging, sealing, wire drawing and reducing diameter, the finished wire is obtained. Th...

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