CN104498961A - Integrated anti-corrosion method for water ballast space with complex structure - Google Patents
Integrated anti-corrosion method for water ballast space with complex structure Download PDFInfo
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Abstract
The invention relates to an integrated anti-corrosion method for a water ballast space with a complex structure and belongs to the technical field of corrosion prevention of water ballast spaces of ships, warships and civil ships. The integrated anti-corrosion method for the water ballast space with the complex structure has the advantages that multiple corrosion prevention methods and means are adopted in a combined manner according to the structure, environment and working condition characteristics of a ballast tank part of a ship, advanced corrosion prevention materials and technologies are integrated for solving the corrosion problem of the ballast tank part in many aspects of corrosion prevention material selection, corrosion prevention design, environmental factors, cathode protection, coating protection, insulated isolation, corrosion detection technology and the like, a high-performance heavy corrosion protection coating system, a high-activity sacrificial anode material, an optimized layout plan, a protection effect detection technology and a dissimilar metal galvanic corrosion protection technology are adopted and are synergistic to form an optimized corrosion prevention integrated technology system, a corrosion prevention validity period can reach up to more than 10 years, the protection degree is more than 90%, and safe application performance of the water ballast space is guaranteed.
Description
Technical field
The present invention relates to the anti-corrosion method of a kind of naval vessel and ship for civil use water ballast tank, specifically a kind of integration corrosion-proof method of complex construction water ballast tank.
Background technology
Marine ballast water tank is often in the bad working environments state of seawater alternation of wetting and drying, and thus corrode very serious, the water ballast tank structure particularly had is very complicated, and cabin is made up of various different material.Such as, some bulkheads are parts for pressure shell, and adopt high-strength steel manufacture, other bulkhead then adopts General Structural Steel.Have the piping system of some copper alloys (as red copper, B10 and B30 cupronickel etc.), stainless steel or even titanium alloy material in cabin toward contact, between they and steel construction, easily generation is contacted by dissimilar metal and the galvanic corrosion that causes simultaneously.Bulkhead structure adopts welding process shaping in addition, can there is electrochemical nonuniformity between weld heat-affected zone and base metal.Also have a lot of rib for reinforcing structure in cabin, the local structure defining segmentation are interval, and easy anticathode protective current produces shielding effect.Adopt common bituminous epoxy coating and sacrificial zinc alloy anode or common aluminum alloy sacrificial anode (as AL-Zn-In-Cd sacrificial anode) to protect in the past; because these sacrificial anodes crust at seawater alternation of wetting and drying operating mode lower surface; very easily produce passivation to lose efficacy; and bituminous epoxy coating is short for work-ing life; and containing pitch, there is environmental issue.Therefore the existing means of defence of water ballast tank can not provide the effective long lifetime to protect; in addition; at present monitoring is lacked to the conservation status in water ballast tank; and the water ballast tank personnel of these complex constructions seldom enter; what have is even difficult to arrival; not easily, there is corrosion damage and potential safety hazard in the not enough problem of the protection of Timeliness coverage existence.
Summary of the invention
Technical assignment of the present invention is for the deficiencies in the prior art, provides a kind of integration corrosion-proof method of complex construction water ballast tank.The method need protect the structure at position, environment and features for boats and ships; combine and adopt multiple corrosion protection method and measure; by the optimization obtaining final protected effect that comprehensively acts synergistically; conservation status is monitored simultaneously, realize the long lifetime protection that water ballast tank is safe, reliable and effective.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of integration corrosion-proof method of complex construction water ballast tank, have employed polynary aluminium alloy sacrificial anode material and the water ballast tank special-purpose coat of the special high-activity function being suitable for alternation of wetting and drying work condition environment, copper, stainless steel and titanium pipeline and parts are adopted to the heavy anticorrosive method of coated insulation coating, the optimization of sacrificial anode quantity and position is carried out by galvanic protection numerical simulation technology, realize the synergy between coating and galvanic protection, make different structured materials all be in best protection scope, thus obtain the anticorrosion ability optimized; Have employed corrosion condition monitoring device simultaneously, understand the guard mode of complex construction water ballast tank in time, guarantee the safe application performance of water ballast tank.
Described polynary aluminium alloy sacrificial anode material take aluminium as raw material, add zinc, indium, gallium, manganese, magnesium, alloy elements, by multiple alloying element its synergistic activation effect, form hexa-atomic aluminium alloy sacrificial anode material, it consists of (in mass %): zinc 2 ~ 7%, indium 0.01 ~ 0.05%, gallium 0.01 ~ 0.04%, magnesium 0.3 ~ 1.5%, iron 0.03 ~ 0.2%, and surplus is aluminium.
Described water ballast tank special-purpose coat (referring to patent No. ZL 201110376683.7), comprise first component and second component, first component and second component combine according to mass ratio 4.3: 1, first component consists of (in mass %): epoxy resin 25 ~ 50%, glycidyl ethers reactive diluents 10 ~ 15%, organobentonite 0.3 ~ 2%, polyamide wax 0.2 ~ 1.5%, adhesion promoter, 0.3 ~ 0.9%, containing acidic-group interpolymer wetting dispersing agent 0 ~ 0.5%, ultrafine mica powder 10 ~ 25%, nano level rust-stabilising pigment 5 ~ 15%, aluminum tripolyphosphate anti-rust pigment 5 ~ 15%, dimethylbenzene 3 ~ 6%, propyl carbinol 3 ~ 6%, second component consists of (in mass %): cashew nut oil modified pnenolic aldehyde amine hardener 60 ~ 80%, dimethylbenzene 15 ~ 30%, propyl carbinol 5 ~ 10%.
Described to copper, the heavy anticorrosive method of stainless steel and titanium pipeline and parts employing coated insulation coating, without the need to copper, stainless steel, the pipeline surfaces such as titanium adopt sandblasting or grinding process, when only carry out surface cleaning and retention surface passive film, the polymer tapes scribbling inhibiter grease is first adopted to carry out coated process, then glass fiber reinforced epoxy resin is adopted to carry out again thereon coated, form insulating coating, not only itself there is provide protection to these pipelines, and the galvanic effect significantly reduced steel construction, also can effectively reduce the required electric current consumed of galvanic anode protection simultaneously, improve Potential distribution, extend the life-span of sacrificial anode, obtain more economical protected effect.
The optimization of described sacrificial anode quantity and position adopts galvanic protection optimizing Design Software test final condition, based on the polarization characteristic of the various different structured material of boundary element numerical evaluation under seawater alternation of wetting and drying operating mode and the analogue simulation of coating degradation and damaged condition, in order to realize galvanic protection optimization, make water ballast tank from the protection initial stage until the latter stage of the protection period effect designed all can obtain good protection; Simultaneously; sacrificial anode adopts stent-type space optimization to arrange; to improve the current shielding effect that the segmenting structures such as rib block mutually, avoid sacrificial anode to be directly welded in high-strength steel structure, produce hydrogen embrittlement danger to eliminate high-strength steel structure, titanium pipe etc. because protection potential crosses negative.By this comprehensive galvanic protection optimization design and sacrificial anode preferred arrangement; not to allow water ballast tank all surface all obtain uniform Potential distribution, but the various differing materials surfaces in complex construction water ballast tank will be made all to be in respective best protection potential range.
Described corrosion condition monitoring device is located in water ballast tank, and it comprises sensor, data collector and analysis software.Sensor comprises potentiometric sensor, temperature sensor, current of galvanic method sensor, coating polarized current density sensor, and sensor is arranged in representative locations in water ballast tank; Data collector has at least 12 passages, is no less than 8 passages for potentiometric detection, and data acquiring frequency can regulate according to needs; Analysis software can obtain the protection potential distribution and over time on water ballast tank surface, current of galvanic method over time, coating polarized current density over time and envrionment temperature and ballast cycle over time.The working order of sacrificial anode, the protected effect of water ballast tank different sites, coating protection performance deterioration law in time, water ballast tank envrionment temperature and operating mode and the impact on corrosionproof protection effect thereof can be understood by analyzing.
The integration corrosion-proof method of above-mentioned complex construction water ballast tank; the conservation status obtained by prison proofing unit and parameter feedback thereof are in foregoing galvanic protection optimizing Design Software; revise by Inversion Calculation and to the final condition of input; the precision of numerical simulation of optimum design can be promoted; the protection scheme of further improvement when upper once depressed place is repaiied or safeguarded; realize loop optimization, Continual Improvement.
The integration corrosion-proof method of above-mentioned complex construction water ballast tank not only can be used for the water ballast tank of boats and ships complex construction, and may be used for boats and ships cabin in other, or the structure of the water ballast tank of oceanographic engineering and other similar operating modes and equipment.
Compared with prior art, the beneficial effect produced is the integration corrosion-proof method of a kind of complex construction water ballast tank of the present invention:
The present invention is directed to water ballast tank own characteristic and corrosion phenomenon, from anticorrosion selection, corrosion protection design, environmental factors, galvanic protection, coating protection, insulation isolation, numerous aspect such as Corrosion monitoring technology adopts advanced impregnating material and Integration ofTechnology to solve its etching problem, select high-performance anticorrosion coat system, high reactivity sacrificial anode material and preferred arrangement scheme, protected effect detection technique and dissimilar metal galvanic corrosion guard technology, make it act synergistically, form optimized protection against corrosion integrated technology system, reach anticorrosion validity period and can reach more than 10 years, protection degree is greater than 90%, guarantee the safe application performance of water ballast tank.
Accompanying drawing explanation
Accompanying drawing 1 is the installation position mimic diagram of water ballast tank proofing unit of the present invention and current potential probe thereof.
Accompanying drawing 2 is the present invention's real ship sacrificial anode layout drawing.
Accompanying drawing 3 is the anode arrangement figure after the real ship sacrificial anode of the present invention is optimized.
Accompanying drawing 4 is water ballast tank galvanic protection measured result figure when integrated aseptic technic do not taked by the real ship of the present invention.
Accompanying drawing 5 takes water ballast tank galvanic protection measured result figure after the integrated aseptic technic of the present invention for the real ship of the present invention.
In figure, 1 represents sacrificial anode.
Embodiment
Below in conjunction with accompanying drawing 1-5, the integration corrosion-proof method of a kind of complex construction water ballast tank of the present invention is described in detail below.
The integration corrosion-proof method of a kind of complex construction water ballast tank of the present invention, have employed polynary aluminium alloy sacrificial anode material and the water ballast tank special-purpose coat of the special high-activity function being suitable for alternation of wetting and drying work condition environment, copper, stainless steel and titanium pipeline and parts are adopted to the heavy anticorrosive method of coated insulation coating, the optimization of sacrificial anode quantity and position is carried out by galvanic protection numerical simulation technology, realize the synergy between coating and galvanic protection, make different structured materials all be in best protection scope, thus obtain the anticorrosion ability optimized; Have employed corrosion condition monitoring device simultaneously, understand the guard mode of complex construction water ballast tank in time, guarantee the safe application performance of water ballast tank.
The integration corrosion-proof method of this complex construction water ballast tank, with polynary aluminium alloy sacrificial anode material, adopt alloying control techniques, by multiple alloying element its synergistic activation effect, form hexa-atomic aluminium alloy sacrificial anode material, it consists of (in mass %): zinc 2 ~ 7%, indium 0.01 ~ 0.05%, gallium 0.01 ~ 0.04%, magnesium 0.3 ~ 1.5%, iron 0.03 ~ 0.2%, and surplus is aluminium.This water ballast tank special-purpose coat index is except should reaching GB/T 6822-2007 standard specifications and requiring; also possess that sea water resistance washes away, wear-resisting, impact resistant performance; when supporting the use with cathodic protection system, its resistance to cathodic electricity place value reaches more than-1.1V (relative to silver/silver chloride electrode); the sticking power of water ballast tank special-purpose coat and body material is greater than 3.0Mpa, and anticorrosion validity period is no less than 10 years.They are under 5 ~ 15 DEG C of execution conditions, can be very fast dry, construction safety, can reduce the injury of solvent to human body.This sacrificial anode material principal character is the operating mode of energy sea water resistance alternation of wetting and drying, the operating potential soaked between dry wetting under alternation condition is still defeated by-1.0V (vs SCE), current efficiency still can be greater than more than 90%, be significantly better than common aluminum alloy sacrificial anode material and ternary sacrificial zinc alloy anode material (referring to table 1).
Table 1, each series of sacrificial anode material main characteristic under a leaching operating mode
* open circuit potential and operating potential is represented relative to saturated calomel electrode.
The integration corrosion-proof method of this complex construction water ballast tank, the water ballast tank special-purpose coat (referring to patent No. ZL 201110376683.7) adopted, comprise first component and second component, first component and second component combine according to mass ratio 4.3: 1, first component consists of (in mass %): epoxy resin 25 ~ 50%, glycidyl ethers reactive diluents 10 ~ 15%, organobentonite 0.3 ~ 2%, polyamide wax 0.2 ~ 1.5%, adhesion promoter, 0.3 ~ 0.9%, the BYK-110 of BYK company is containing acidic-group interpolymer wetting dispersing agent 0 ~ 0.5%, granularity requirements is 1250 object ultrafine mica powders 10 ~ 25%, nano level rust-stabilising pigment 5 ~ 15%, aluminum tripolyphosphate anti-rust pigment 5 ~ 15%, dimethylbenzene 3 ~ 6%, propyl carbinol 3 ~ 6%, second component consists of (in mass %): cashew nut oil modified pnenolic aldehyde amine hardener 60 ~ 80%, dimethylbenzene 15 ~ 30%, propyl carbinol 5 ~ 10%, wherein said nano level rust-stabilising pigment is composite iron-titanium powder, it consists of nano silicon and Z 250 powder, and Particle size requirements is 325 orders and 500 objects any one or its median diameter thing.
The integration corrosion-proof method of this complex construction water ballast tank, for copper, stainless steel, the metal tubes such as titanium and component have employed the heavy anticorrosive method of insulating wrapped, without the need to copper, stainless steel, the pipeline surfaces such as titanium adopt sandblasting or grinding process, when only carry out surface cleaning and retention surface passive film, the polymer tapes scribbling inhibiter grease is first adopted to carry out coated process, then glass fiber reinforced epoxy resin is adopted to carry out again thereon coated, form insulating coating, not only itself there is provide protection to these pipelines, and the galvanic effect significantly reduced steel construction, also can effectively reduce the required electric current consumed of galvanic anode protection simultaneously, improve Potential distribution, extend the life-span of sacrificial anode, obtain more economical protected effect.
The optimization of described sacrificial anode quantity and position adopts galvanic protection optimizing Design Software test final condition, based on the polarization characteristic of the various different structured material of boundary element numerical evaluation under seawater alternation of wetting and drying operating mode and the analogue simulation of coating degradation and damaged condition, in order to realize galvanic protection optimization, make water ballast tank from the protection initial stage until the latter stage of the protection period effect designed all can obtain good protection; Simultaneously; sacrificial anode adopts stent-type space optimization to arrange; to improve the current shielding effect that the segmenting structures such as rib block mutually, avoid sacrificial anode to be directly welded in high-strength steel structure, produce hydrogen embrittlement danger to eliminate high-strength steel structure, titanium pipe etc. because protection potential crosses negative.By this comprehensive galvanic protection optimization design and sacrificial anode preferred arrangement; not to allow water ballast tank all surface all obtain uniform Potential distribution, but the various differing materials surfaces in complex construction water ballast tank will be made all to be in respective best protection potential range.
The integration corrosion-proof method of this complex construction water ballast tank, also comprises the corrosion condition proofing unit be arranged in water ballast tank, for understanding actual conservation status, and the result of checking optimization design, and provide foundation for the further improvement raising of Corrosion prevention scheme.It comprises sensor, data collector and analysis software.Sensor comprises potentiometric sensor, temperature sensor, current of galvanic method sensor, coating polarized current density sensor, and sensor is arranged in representative locations in water ballast tank; Data collector has at least 12 passages, is no less than 8 passages for potentiometric detection, and data acquiring frequency can regulate according to needs; Analysis software can obtain the protection potential distribution and over time on water ballast tank surface, current of galvanic method over time, coating polarized current density over time and envrionment temperature and ballast cycle over time.The working order of sacrificial anode, the protected effect of water ballast tank different sites, coating protection performance deterioration law in time, water ballast tank envrionment temperature and operating mode and the impact on corrosionproof protection effect thereof can be understood by analyzing.
The integration corrosion-proof method of above-mentioned complex construction water ballast tank; the conservation status obtained by prison proofing unit and parameter feedback thereof are in foregoing galvanic protection optimizing Design Software; revise by Inversion Calculation and to the final condition of input; the precision of numerical simulation of optimum design can be promoted; the protection scheme of further improvement when upper once depressed place is repaiied or safeguarded; realize loop optimization, Continual Improvement.
Choosing certain type ship bow No. 2 water ballast tanks is research object, carries out integration corrosion-proof conceptual design, and this cabin pressure shell adopts 921A steel, and non-pressure shell adopts 907A steel, and rib adopts 925 steel.Internal diameter 6.74m, external diameter 8.32m, long 6.0m, every 60 centimeter of one root bone.
1, water ballast tank special-purpose coat is applied to this water ballast tank; the heavy anticorrosive method of insulating wrapped is adopted to protect for the metal tubes such as copper, stainless steel, titanium and component; sacrificial anode adopts hexa-atomic aluminium alloy sacrificial anode material; be provided with proofing unit and the reference electrode of corrosion condition in water ballast tank, the installation position of water ballast tank proofing unit and current potential probe thereof as shown in Figure 1.
2, CATIA software is adopted to set up the structure iron of water ballast tank, sacrificial anode is arranged according to standard-required, mounting means is: install three pieces of anodes between No. 1 rib and No. 2 ribs, between No. 4 ribs and No. 5 ribs, two pieces of anodes are installed, between No. 7 ribs and No. 8 ribs, three pieces of anodes are installed, as shown in Figure 2,1 sacrificial anode is represented in figure.The sacrificial anode layout optimization carried out afterwards is the improvement carried out based on this decoration form.
3, the water ballast tank structure iron of foundation is read in galvanic protection optimization design platform; the design of galvanic protection numerical simulation of optimum is carried out to it; investigate its potential range and distribution situation; be arranged on the corrosion condition proofing unit in water ballast tank; can be used for understanding actual conservation status; the result of checking optimization design, and provide foundation for the further improvement raising of Corrosion prevention scheme.
4, through numerical simulation calculation, determine that the arrangement after sacrificial anode optimization is be evenly arranged five pieces of sacrificial anodes between 1,2 ribs, 4, two pieces of sacrificial anodes are evenly arranged between 5 ribs, 7, four pieces of sacrificial anodes are arranged between 8 ribs, Sea Chest arranges one piece of sacrificial anode, as shown in Figure 3, sacrificial anode is of a size of 200mm × (70+90) mm × 70mm to concrete position, and Sea Chest sacrificial anode is of a size of 500mm × (110+130) mm × 120mm.
Fig. 4 is the galvanic protection effect of this ship water ballast tank when not taking integrated aseptic technic.As seen from the figure; although the aseptic technic that real ship was equipped with originally can play certain provide protection to water ballast tank; interior cabin protective potential range is mostly in as between-800mV ~-860mV (vs SCE); but there is under proteciton and that Potential distribution is uneven shortcoming; and along with the prolongation of ship active time; the breakage of coating, the consumption of sacrificial anode all can cause the protection potential of water ballast tank just becoming gradually, and danger under proteciton likely occurs water ballast tank.
Fig. 5 is the simulate effect figure after taking the integrated aseptic technic protection of water ballast tank; compared with Fig. 4; water ballast tank protection potential after integrated optimization is anticorrosion is negative before obviously comparatively optimizing to be moved; and cathodic protection potential is more evenly distributed; protective potential range is mostly in as between-900mV ~-1050mV (vs SCE), can meet the demand of water ballast tank long-effective corrosion.
The integration corrosion-proof method of complex construction water ballast tank of the present invention not only can be used for the water ballast tank of boats and ships complex construction, and may be used for boats and ships cabin in other, or the structure of the water ballast tank of oceanographic engineering and other similar operating modes and equipment.
Claims (7)
1. the integration corrosion-proof method of a complex construction water ballast tank, it is characterized in that, have employed polynary aluminium alloy sacrificial anode material and the water ballast tank special-purpose coat of the special high-activity function being suitable for alternation of wetting and drying work condition environment, copper, stainless steel and titanium pipeline and parts are adopted to the heavy anticorrosive method of coated insulation coating, the optimization of sacrificial anode quantity and position is carried out by galvanic protection numerical simulation technology, realize the synergy between coating and galvanic protection, make different structured materials all be in best protection scope, thus obtain the anticorrosion ability optimized; Have employed corrosion condition monitoring device simultaneously, understand the guard mode of complex construction water ballast tank in time, guarantee the safe application performance of water ballast tank.
2. the integration corrosion-proof method of a kind of complex construction water ballast tank according to claim 1, it is characterized in that, described polynary aluminium alloy sacrificial anode material take aluminium as raw material, add zinc, indium, gallium, manganese, magnesium, alloy elements, by multiple alloying element its synergistic activation effect, form hexa-atomic aluminium alloy sacrificial anode material, it consists of (in mass %): zinc 2 ~ 7%, indium 0.01 ~ 0.05%, gallium 0.01 ~ 0.04%, magnesium 0.3 ~ 1.5%, iron 0.03 ~ 0.2%, and surplus is aluminium.
3. the integration corrosion-proof method of a kind of complex construction water ballast tank according to claim 1 and 2, it is characterized in that, described water ballast tank special-purpose coat, comprise first component and second component, first component and second component combine according to mass ratio 4.3: 1, first component consists of (in mass %): epoxy resin 25 ~ 50%, glycidyl ethers reactive diluents 10 ~ 15%, organobentonite 0.3 ~ 2%, polyamide wax 0.2 ~ 1.5%, adhesion promoter, 0.3 ~ 0.9%, containing acidic-group interpolymer wetting dispersing agent 0 ~ 0.5%, ultrafine mica powder 10 ~ 25%, nano level rust-stabilising pigment 5 ~ 15%, aluminum tripolyphosphate anti-rust pigment 5 ~ 15%, dimethylbenzene 3 ~ 6%, propyl carbinol 3 ~ 6%, second component consists of (in mass %): cashew nut oil modified pnenolic aldehyde amine hardener 60 ~ 80%, dimethylbenzene 15 ~ 30%, propyl carbinol 5 ~ 10%.
4. the integration corrosion-proof method of a kind of complex construction water ballast tank according to claim 3, it is characterized in that, described heavy anticorrosive method copper, stainless steel and titanium pipeline and parts being adopted to coated insulation coating, without the need to adopting sandblasting or grinding process to copper, stainless steel, titanium pipeline surface, when only carry out surface cleaning and retention surface passive film, the polymer tapes scribbling inhibiter grease is first adopted to carry out coated process, then adopt glass fiber reinforced epoxy resin to carry out again thereon coated, form insulating coating.
5. the integration corrosion-proof method of a kind of complex construction water ballast tank according to claim 4; it is characterized in that; the optimization of described sacrificial anode quantity and position adopts galvanic protection optimizing Design Software test final condition; based on the polarization characteristic of the various different structured material of boundary element numerical evaluation under seawater alternation of wetting and drying operating mode and the analogue simulation of coating degradation and damaged condition, and sacrificial anode adopts stent-type space optimization to arrange.
6. the integration corrosion-proof method of a kind of complex construction water ballast tank according to claim 5, is characterized in that, described corrosion condition monitoring device is located in water ballast tank, and it comprises sensor, data collector and analysis software; The conservation status obtained by prison proofing unit and parameter feedback thereof are in galvanic protection optimizing Design Software; revise by Inversion Calculation and to the final condition of input; promote the precision of numerical simulation of optimum design; the protection scheme of further improvement when upper once depressed place is repaiied or safeguarded; realize loop optimization, Continual Improvement.
7. the integration corrosion-proof method of a kind of complex construction water ballast tank according to claim 6, it is characterized in that, the integration corrosion-proof method of above-mentioned complex construction water ballast tank not only can be used for the water ballast tank of boats and ships complex construction, and may be used for boats and ships cabin in other, or the structure of the water ballast tank of oceanographic engineering and other similar operating modes and equipment.
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| EP3283807A4 (en) * | 2015-05-28 | 2018-05-16 | Electrosteel Castings Limited an Indian Ltd. Co | Corrosion resistant buried underground ductile cast iron piping members with an improved external coating and the method thereof |
| CN111284644A (en) * | 2020-03-13 | 2020-06-16 | 上海外高桥造船有限公司 | Liquid cargo tank and floating oil storage ship |
| CN111378975A (en) * | 2020-04-26 | 2020-07-07 | 中山大学 | Sacrificial anode protection device for rapid installation of ballast water tank and use method thereof |
| CN113283137A (en) * | 2021-05-24 | 2021-08-20 | 中国兵器工业第五九研究所 | Structural member corrosion effect control simulation method under organic protective coating system |
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