CN104073757B - Strengthen the method for ocean structure steel resistance to corrosion fatigue performance - Google Patents
Strengthen the method for ocean structure steel resistance to corrosion fatigue performance Download PDFInfo
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- CN104073757B CN104073757B CN201410339429.3A CN201410339429A CN104073757B CN 104073757 B CN104073757 B CN 104073757B CN 201410339429 A CN201410339429 A CN 201410339429A CN 104073757 B CN104073757 B CN 104073757B
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Abstract
The invention belongs to metallic material corrosion field, particularly, relating to a kind of method strengthening ocean structure steel resistance to corrosion fatigue performance, for improving the engineering service life of ocean structure steel.1), surface cleaning process strengthen the method for ocean structure steel resistance to corrosion fatigue performance, comprise the following steps:; 2), derusting by sandblast; 3), arc spraying zinc aluminum alloy; 4), removing surface, spraying detect; 5), sealing treatment; 6), spraying or brushing seal coating.Ocean structure steel corrosion fatigue resistance prepared by the present invention is strong, is convenient to widespread use in oceanographic engineering.
Description
Technical field
The invention belongs to metallic material corrosion field, particularly, relating to a kind of method strengthening ocean structure steel resistance to corrosion fatigue performance, for improving the engineering service life of ocean structure steel.
Background technology
There is the various steel construction bearing cyclic loading in oceanographic engineering, as drilling water-separation pipe, production riser etc., be in for a long time in salt fog, seawater, be subject to the long-term erosion of rough seas, extremely easily corrosion-fatigue failure occur, have a strong impact on production operation safety.Corrosive atmosphere can reduce the FATIGUE FRACTURE TOUGHNESS of steel construction, accelerates germinating and the expansion of crackle, significantly reduces service life.Because maintenance cost is high, the corrosion fatigue resistant ability how improving structure iron becomes the primary key issue solved.
Summary of the invention
For overcoming the problems referred to above, the object of the present invention is to provide a kind of method strengthening ocean structure steel resistance to corrosion fatigue performance, the method effectively can improve the corrosion fatigue life of ocean steel construction.
For achieving the above object, the present invention adopts following technical scheme:
Strengthen the method for ocean structure steel resistance to corrosion fatigue performance, comprise the following steps:
1), surface cleaning process
2), derusting by sandblast
3), arc spraying zinc aluminum alloy
4), removing surface, spraying detect
5), sealing treatment
6), spraying or brushing seal coating.
Relative to prior art, the present invention has following beneficial effect: prepared ocean structure steel corrosion fatigue resistance is strong, is convenient to widespread use in oceanographic engineering.
Accompanying drawing explanation
Fig. 1 is ocean structure steel Preparation Method schematic flow sheet;
Embodiment
As shown in Figure 1, strengthen the method for ocean structure steel resistance to corrosion fatigue performance, comprise the following steps:
1), surface cleaning process
Select X80 structure iron, check structure iron workpiece outward appearance, effects on surface burr, overlap are polished, and adopt craft or power tool to eliminate rust.
After process, structure iron surface is without visible grease and dirt, and without the oxide skin of adhering to, iron rust and coat of painting, rust cleaning result should reach the requirement of national regulation ISO8501-1Sa2.5 level, and structure iron surface should show uniform metalluster.Surfaceness reaches 50 ~ 80 μm.
2), derusting by sandblast
For roughness and the cleanliness factor of security deposit's metal surface, sand-blasting abrasive adopts copper ore or emergy, and have corner angle, grit size is between 0.5 ~ 1.5mm, keeps clean dry; Sandblasting distance remains in 100 ~ 200mm, and angle remains between 70 ~ 80 degree.
Construction adopts airtight sandblasting, and has ventilation equipment; Utilize pressurized air during sandblasting, by jet absorption type or pressure type sandblast apparatus sand-blasting abrasive, clean and roughening treatment are implemented, until matrix surface is canescence metal appearance and uniform alligatoring face to matrix surface; Pressurized air has to pass through water-and-oil separator of good performance, surge tank just can enter spray gun later, and pressurized air must keep clean dry, and pressure keeps 0.5MPa.
After rust cleaning, degree of cleaning reach Sa3 level, and grit blasting operation, from not seeing surfaceness change, then continues to be sprayed onto 25% of former blast time, ensures that roughening treatment rear surface roughness reaches Rz50 ~ 100 μm.
3), arc spraying zinc aluminum alloy
Electric arc spraying take electric arc as thermal source, and thread aluminium zinc (zinc 85%, aluminium 15%) is heated to molten state, blows out vaporific with pressurized gas by aluminium zinc, forms grain flow even application at matrix surface.Spray zinc used, aluminum-alloy wire surface should smooth, non-oxidation, without grease, do not allow comparatively serious surface imperfection, wire rod coiling does not allow to occur bending and serious twist and warping.Electric arc spraying zinc, aluminium wire chemical composition should meet the specification of quality of 1060Al in specification GB/T3190-1996 " distortion Al and Alalloy composition ".
After spraying preparation work is ready, switches on power, stir wire feed switch and advance and retreat silk switch is placed in into a position, requiring that both sides wire travelling speed is consistent.Arc voltage controls at 25 ~ 35V, and regulate working current to be 150 ∽ 200A, compressed air pressure controls at about 0.6MPa, air demand 3m3/min, during spraying, spray gun should be as far as possible vertical with working face, when cannot vertically spraying plating, its angle must not be less than 45.Adopt layering sputtering process, the thickness of every layer of alloy film should be even, is 50 μm, front one deck vertical with later layer or 45 degree intersect and spray.Adjacent spraying plating region will overlap 1/3 width, and timed interval of its layering spraying plating must not more than 2h, and component spraying should be first corner, at top, the order of back plane carries out, and should prevent the phenomenon after component surface deposited metal local.The translational speed of spraying is 80 ~ 100mm/s, and aluminium wire wire travelling speed is 1 ~ 2m/min.After spraying, surface alloy thickness reaches 120 ~ 240 μm.Stop should first closing into a switch during spraying, last closes compression air.
4), removing surface, spraying detect
After spraying application, outward appearance should be carried out by professional supervisory personnel, dissolve degree and thickness checks.Outward appearance visual inspection, coatingsurface is answered inclusion-free, is stuck up skin, bubbling, crackle, molten drop and decortication phenomenon are qualified; If any molten drop, clear up and repair thickness in time.Check with magnetic-type gage, any point one-tenth-value thickness 1/10 recorded, all between A+20 μm ~ A-30 μm (A is design coating thickness).
5), sealing treatment
The complete structure iron workpiece of spraying is exposed to painting workshop 24 hours, and sprayed coating and the fully oxidized reaction of air, make the space natural enclosing of sprayed coating.
Sealing treatment effectively can reduce the intrinsic space of sprayed coating, increases protection effect.
6), spraying or brushing seal coating
Seal coating comprises seal coat and finish paint, and seal coat adopts epoxy micaceous iron seal coat, and finish paint adopts chlorinated rubber.
Adopt high pressure airless spraying apparatus to spray, ensure before spraying that arc spray coatings surface is without dirt and steam, spray pressure remains on 0.5 ~ 0.6MPa, and spray distance can not be less than 200mm, and basecoat paint thickness is 30 μm, and finish paint coating thickness is 80 μm.
Carry out finish paint spraying again after seal coat spraying, front road paint complete drying will be ensured before spraying, and remove greasy dirt and the foreign material on seal coat surface.
Dope layer has not allowed to peel off, sting the end, holiday, demixing phenomenon.Coating should be even, smooth, plentiful glossy, allows the little orange peel, sagging, the wrinkling and a small amount of granule foreign that do not affect barrier propterty.Seal coat and metallic coating are in conjunction with firm, and cross-hatching reaches 1 grade.To note in spraying protecting contiguous surface around, prevent the pollution of dust fall, especially will protect the surface of coated paint.
Claims (1)
1. strengthen a method for ocean structure steel resistance to corrosion fatigue performance, it is characterized in that, comprise the following steps:
1), surface cleaning process
2), derusting by sandblast
3), arc spraying zinc aluminum alloy
4), removing surface, spraying detect
5), sealing treatment
6), spraying or brushing seal coating;
Surface cleaning process, specific as follows: to select X80 structure iron, check structure iron workpiece outward appearance, effects on surface burr, overlap are polished, and adopt craft or power tool to eliminate rust;
After process, structure iron surface is without visible grease and dirt, and without the oxide skin of adhering to, iron rust and coat of painting, rust cleaning result should reach the requirement of national regulation ISO8501-1Sa2.5 level, and structure iron surface should show uniform metalluster; Surfaceness reaches 50 ~ 80 μm;
Derusting by sandblast, specific as follows: sand-blasting abrasive adopts copper ore or emergy, and have corner angle, grit size is between 0.5 ~ 1.5mm, keep clean dry; Sandblasting distance remains in 100 ~ 200mm, and angle remains between 70 ~ 80 degree; Construction adopts airtight sandblasting, and has ventilation equipment; Utilize pressurized air during sandblasting, by jet absorption type or pressure type sandblast apparatus sand-blasting abrasive, clean and roughening treatment are implemented, until matrix surface is canescence metal appearance and uniform alligatoring face to matrix surface; Pressurized air has to pass through water-and-oil separator of good performance, surge tank just can enter spray gun later, and pressurized air must keep clean dry, and pressure keeps 0.5MPa; After rust cleaning, degree of cleaning reach Sa3 level, and grit blasting operation, from not seeing surfaceness change, then continues to be sprayed onto 25% of former blast time, ensures that roughening treatment rear surface roughness reaches Rz50 ~ 100 μm;
Arc spraying zinc aluminum alloy, specific as follows: electric arc spraying take electric arc as thermal source, and thread aluminium zinc is heated to molten state, with pressurized gas, aluminium zinc is blown out vaporific, form grain flow even application at matrix surface; Spray zinc used, aluminum-alloy wire surface should smooth, non-oxidation, without grease, do not allow comparatively serious surface imperfection, wire rod coiling does not allow to occur bending and serious twist and warping; Electric arc spraying zinc, aluminium wire chemical composition should meet the specification of quality of 1060Al in specification GB/T3190-1996 " distortion Al and Alalloy composition "; After spraying preparation work is ready, switches on power, stir wire feed switch and advance and retreat silk switch is placed in into a position, requiring that both sides wire travelling speed is consistent; Arc voltage controls at 25 ~ 35V, and adjustment working current is 150 ~ 200A, and compressed air pressure controls at about 0.6MPa, air demand 3m
3/ min, during spraying, spray gun should be as far as possible vertical with working face, when cannot vertically spraying plating, its angle must not be less than 45; Adopt layering sputtering process, the thickness of every layer of alloy film should be even, is 50 μm, front one deck vertical with later layer or 45 degree intersect and spray; Adjacent spraying plating region will overlap 1/3 width, and timed interval of its layering spraying plating must not more than 2h, and component spraying should be first corner, at top, the order of back plane carries out, and should prevent the phenomenon after component surface deposited metal local; The translational speed of spraying is 80 ~ 100mm/s, and aluminium wire wire travelling speed is 1 ~ 2m/min; After spraying, surface alloy thickness reaches 120 ~ 240 μm; Stop should first closing into a switch during spraying, last closes compression air;
Removing surface, spraying detect, specific as follows: after spraying application, should carry out outward appearance, dissolve degree and thickness checks by professional supervisory personnel; Outward appearance visual inspection, coatingsurface is answered inclusion-free, is stuck up skin, bubbling, crackle, molten drop and decortication phenomenon are qualified; If any molten drop, clear up and repair thickness in time; Check with magnetic-type gage, any point one-tenth-value thickness 1/10 recorded, all between A+20 μm ~ A-30 μm, A is design coating thickness;
Sealing treatment, specific as follows: the complete structure iron workpiece of spraying is exposed to painting workshop 24 hours, and sprayed coating and the fully oxidized reaction of air, make the space natural enclosing of sprayed coating; Sealing treatment effectively can reduce the intrinsic space of sprayed coating, increases protection effect;
Spraying or brushing seal coating, specific as follows: seal coating comprises seal coat and finish paint, seal coat adopts epoxy micaceous iron seal coat, and finish paint adopts chlorinated rubber; Adopt high pressure airless spraying apparatus to spray, ensure before spraying that arc spray coatings surface is without dirt and steam, spray pressure remains on 0.5 ~ 0.6MPa, and spray distance can not be less than 200mm, and basecoat paint thickness is 30 μm, and finish paint coating thickness is 80 μm; Carry out finish paint spraying again after seal coat spraying, front road paint complete drying will be ensured before spraying, and remove greasy dirt and the foreign material on seal coat surface; Dope layer has not allowed to peel off, sting the end, holiday, demixing phenomenon; Coating should be even, smooth, plentiful glossy, allows the little orange peel, sagging, the wrinkling and a small amount of granule foreign that do not affect barrier propterty; Seal coat and metallic coating are in conjunction with firm, and cross-hatching reaches 1 grade; To note in spraying protecting contiguous surface around, prevent the pollution of dust fall, protect the surface of coated paint.
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| CN203371858U (en) * | 2013-04-12 | 2014-01-01 | 江苏中矿大正表面工程技术有限公司 | Anticorrosion composite coating structure used for welding seam of steel structures |
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