201 results about "Microbial corrosion" patented technology

The invention relates to a formula of a culture medium for high yield beech mushrooms and a production process. The invention relates to the technical field of biological fungus cultivation, in particular to the formula of the culture medium for high yield beech mushrooms and a production process. The production process comprises the following steps: removing lignin, semi lignin, cellulose and thelike in wood chips and corn cobs by using a microbial corrosion catalyst; releasing contents of the wood chip and the corn cobs through biological fermentation to provide sufficient nutrients for thegrowth and development of the beech mushrooms; and fully degrading and releasing nutritional compositions of raw materials which constitute the culture medium through microbial degradation, and providing with matched environmental factors such as light, temperature, humidity, air and the like which are suitable for the growth and development of the beech mushrooms so as to improve the yield and the quality of a single bottle.

The invention relates to a test method for lossless monitoring and detection for the material accelerated corrosion under a simulated marine environment, which comprises a corrosion accelerating test under the simulated marine environment and a test for the lossless monitoring and detection for the corrosion potential of material, wherein the corrosion accelerating test under the simulated marine environment is performed on a corrosion accelerating module, which can be used for finishing the tests for the marine or industrial atmospheric corrosion, splashed spoondrift corrosion, tidal range corrosion, full-soaking corrosion and sea mud microbiological corrosion. The test for the lossless monitoring and detection for the corrosion potential of material is finished by using a corrosion potential lossless monitoring and detection module. The method provided by the invention has the advantages that an environment for simulating each corrosion area in the ocean is supplied, the test period is shortened by performing the corrosion accelerating test, and the corrosion degree of the material is monitored and detected in the whole process. The method is used for supplying a technical support for evaluating the corrosion resistance of the material under the marine environment, thereby shortening the period of researching and testing the material.

The present invention relates to a method of inhibiting biofilms by combinations of antimicrobials, particularly with their synergistic activity against bioFilms. The antimicrobials include combination of copper ion and quaternary ammonium compound or combination of copper ion and peroxide. The invention also include methods for inhibiting biofilm-induced microbial corrosion or fouling.

The invention relates to three compound stabilizer reagents which can effectively protect various water pipelines, water containers and the relevant equipment of the water conveyance system from biodeterioration or scaling and the treatment method and the utilization of the biodeterioration. Particularly, by utilizing the three compound stabilizer reagents acting on the water conveyance system in different period respectively, the addition dosage and the time can change according to different water quality, different microorganism pollution degree and different water treatment demand, wherein each compound stabilizer reagent main component has different sterilization mechanisms and the emphases of the reagent is also different, so that serious corrosion caused by the drug resistance of the bacteria can be solved and the sulfate reducing bacteria, the saprophyte, the iron bacteria, the nitrite bacteria, the ammonium bacteria and algae in the water conveyance system can be completely killed. The compound stabilizer reagents is suitable for the control of pipeline scaling and the pipe wall biodeterioration of the oil field water injection system, the circulating water system and the central air-conditioning cooling water system.

The invention belongs to the field of corrosion test and electrochemical test technology and particularly provides an electrochemical corrosion and test device of dynamic microbial corrosion process, which is suitable for metal microbial corrosion behavior and mechanism study under normal pressure and dynamic operating condition of corrosion medium, in particular to electrochemical signal test of microbial corrosion process under dynamic condition. The device is characterized in that the device is composed of a motor, a shaft, a carbon brush, a fixture, a three-electrode system, a signal transduction path, an external electrochemical test apparatus, a sealed test chamber, a thermostatic water bath, a bacteriological incubator and a waste collection box, wherein the motor is connected with the shaft through a shaft coupler; the shaft is fixed on the upper cover of the sealed test chamber through a bearing; a sample fixture is fixed on the other end of the shaft; and the three-electrode system is connected with an external electromagnetic test instrument through the signal transduction path. The device can monitor electrochemical signals of a work electrode under the dynamic conditions and provide a sample for corrosion weight loss and profile observation. The box body (11) of the device is made of transparent organic glass, so that the change in color and turbidity degree of the corrosion medium containing microbes can be observed. Two out-laid containers can achieve update of bacterial liquid in the test process, so that the invention is more suitable for study of microbial corrosion behavior and mechanism.

The invention discloses a low temperature antibacterial heavy-duty fusion-bonded epoxy powder coating which is formed by mixing a component A and a component B according to a mass ratio of 4 to 8:1, wherein the component A comprises raw materials with the mass percentages as follows: 5 to 20 percent of phenolic modified epoxy resin, 30 to 60 percent of bisphenol A epoxy resin, 5 to 20 percent of curing agents, 0.1 to 1 percent of accelerating agents, 1 to 5 percent of flow agents, 1 to 5 percent of pigment and 20 to 40 percent of filler; the component B comprises raw materials with the mass percentages as follows: 75 to 92 percent of epoxy resin, 5 to 15 percent of antioxidants and 1 to 10 percent of nano-antibacterial agents. Besides, the invention further provides a preparation method of the coating. The powder coating disclosed by the invention has excellent physical and chemical performance, chemical corrosion resistance and microbial corrosion resistance, simultaneously has the characteristic of low temperature rapid solidification, can reduce the production cost, can save energy resources and is easy to popularize and apply.

The invention discloses a compound of a metal organic framework encapsulation corrosion inhibitor and a preparation method and application thereof. The compound is composed of a ZIF metal organic framework material and the corrosion inhibitor encapsulated in the ZIF metal organic framework material. A composite material system is applied to a sea wave splashing zone, and carbon steel or a metal product make a metal organic framework generate defects due to the local acidic environment in the initial stage of dry-wet circulation alternating corrosion, so that the corrosion inhibitor is released, and targeted protection of a corrosion-induced region can be realized. Furthermore, the copper ion modified thiazole corrosion inhibitor is encapsulated in the metal organic framework so that highertransfer capacity can be obtained. Meanwhile, copper ions are desorbed from a pre-coordinated corrosion inhibitor shielding site under an acidic microenvironment, and microbial corrosion caused by growth of various aerobic bacteria on the surface of a substrate can be further inhibited. The corrosion inhibition system is high in targeting property, efficient, durable, high in cost performance, remarkable in application value and wide in market prospect.

The invention discloses microbiological corrosion resisting duplex stainless steel and a heat treatment technology thereof. The duplex stainless steel is prepared from, by weight percent, not larger than 0.03% of C, not larger than 1.00% of Si, not larger than 2.00% of Mn, not larger than 0.01% of S, not larger than 0.02% of P, 21%-32% of Cr, 2.0%-5.0% of Mo, 2.0%-6.0% of Cu, 0.1%-0.3% of N, 4.0%-8.0% of Ni and the balance Fe. The content of impurity elements in an alloy meets the corresponding requirement in the national standard of the duplex stainless steel. The novel material of the duplex stainless steel has the unique function of restraining bacterial biofilm generation; the risk that microbiological corrosion happens when the duplex stainless steel is used in different use environments can be remarkably reduced; and the duplex stainless steel can be widely used in the ocean, petroleum and gas and other fields where the duplex stainless steel is greatly applied.

The invention discloses an algae-removal bacteriostatic silicone rubber insulating material, which comprises vulcanized silicone rubber. The vulcanized silicone rubber contains composite aerogel supporting antimicrobial agent metal / metal ion. A method for preparing the silicone rubber insulating material comprises the following steps: adding the composite aerogel supporting antimicrobial agent metal / metal ion into raw materials for preparation of the vulcanized silicone rubber, mixing and carrying out vulcanization molding to obtain the silicone rubber insulating material. According to the insulating material, growth of microbes on the surface of silicone rubber can be effectively prevented, formation of a bio-film is avoided, and the composite insulating material is prevented from being corroded by microbes.

The invention discloses a high-temperature type viscoelastic body corrosion-preventing sealing adhesive tape and a preparation method thereof. The high-temperature type viscoelastic body corrosion-preventing sealing adhesive tape is in a layer-shaped structure and is sequentially composed of a polyethylene film, a first viscoelastic body sizing layer, a polyethylene net layer, a second viscoelastic body sizing layer and a polyethylene terephthalate (PET) adhesion-preventing film. The first viscoelastic body sizing layer and the second viscoelastic body sizing layer are both composed of the following materials including, by weight, 2 to 5 parts of low molecular weight polyisobutene, 35 to 45 parts of medium molecular weight polyisobutene, 5 to 10 parts of high molecular weight polyisobutene, 40 to 50 parts of inorganic filler, 0.2 to 0.5 part of antioxidant and 0.0001 to 0.0005 part of pigment. The high-temperature type viscoelastic body corrosion-preventing sealing adhesive tape can be used for corrosion-preventing protection of oil and gas pipelines and abnormal devices, has unique cold flow property, can achieve a self-repairing function in the corrosion-preventing process, can thoroughly prevent moisture from invading simultaneously, thoroughly avoids microorganism corrosion, and has good long-acting protection.

A high-efficiency autotrophic denitrification water quality regulation bacterium agent is characterized by comprising thiobacillus denitrificans, photosynthetic sulfur bacteria and inorganic salt including nitrate, phosphate and the like for promoting bacterial growth. The thiobacillus denitrificans and photosynthetic sulfur bacteria respectively account for 80%-95% and 5%-20%, and the total salinity of the inorganic salt is 1.5%. A microbial compound bacterium agent is wide in application, and can be applied to blockage of sulfide in ageing oil, microorganism corrosion in an oil field oil extraction water treatment system, smoke desulfuration in power plants, sediment deodorization and H2S removal in municipal sewage and slaughter wastewater, denitrification and phosphorus control of eutrophication natural lakes, degradation of nitrate and nitrite in aquaculture, and the like. The bacterium agent has unique desulfuration and denitrification physiological properties, can perform synchronous desulfuration and denitrification, requires no addition of organic matter, has mild reaction conditions and remarkable effects, and can be applied to multiple fields. In addition, reaction products are safe and innocuous.

The invention provides a PE sheath material for a submarine cable. The PE sheath material comprises, by weight, 100 parts of PE, 8-12 parts of modified hemp fibers, 6-10 parts of modified magnesium oxide, 0.2-0.3 parts of an anti-oxidant, 9-10 parts of EVA, 2-3 parts of carbon black, 3-4 parts of calcium carbonate, 0.1-0.2 parts of a stabilizing agent and 0.1 parts of a coupling agent. The invention also provides a preparation method of the PE sheath material. The PE sheath material for a submarine cable has good sea water corrosion resistance and microbiological corrosion resistance, can effectively reduce corrosion damage and has a long service life.

The invention discloses a compound for a metal organic framework encapsulating corrosion inhibitor and a preparation method and application thereof. The compound is composed of a ZIF metal organic framework material and a corrosion inhibitor packaged therein. A compound material system is applied to a sea water spoondrift splashing area. The metal organic framework generates defects to release thecorrosion inhibitor by carbon steel or a metal product as a result of a local acid environment in an alternative corrosion initial stage of drying and watering cycle, so that targeted protection to acorrosion inducing area can be achieved. Furthermore, a copper ion modified thiazole corrosion inhibitor is encapsulated on the metal organic framework, so that a higher transfer load can be obtained. Meanwhile, in the acid micro-environment, copper ions are desorbed from a shield site of the pre-coordinated corrosion inhibitor, so that microbial corrosion caused by growth of various aerobic bacteria on the surface of a substrate can be also inhibited. A corrosion system is high in targeting property, efficient and durable and high in cost performance, and has the remarkable application valueand the wide market prospect.

The invention belongs to the technical field of industrial water treatment, and relates to a biological agent for maintaining the stability of a circulating cooling water system, and a preparation method and application thereof. The biological agent for maintaining the stability of a circulating cooling water system is composed of carbonic anhydrase-producing bacteria, lactobacillus, saccharomycetes, Bacillus and photosynthetic bacteria, can inhibit propagation of corrosion bacteria and algae in circulating water, reduces system oxygen corrosion, microbiological corrosion and salt corrosion, can dissolve hard scales generated in the circulating water system, prevents formation of new hard scales, improves the quality of the circulating water, maintains the stability of the circulating cooling water system, increases the concentration ratio, and realizes energy saving and emission reduction.

The invention discloses high-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) and a manufacturing method thereof. The stainless steel comprises carbon, silicon, manganese, chromium, molybdenum, copper, nitrogen, niobium, silver and the balance of iron by weight percent; the high-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) is of a single austenite structure after subjected to solution treatment, and is excellent in pitting corrosion resistance in a non-microorganism environment and good in bacterial resistance and microorganism corrosion resistance in a microorganism environment; the antibacterial rate of the stainless steel on staphylococcus aureus and escherichia coli reaches more than 93%; the nickel release risk is inexistent; the manganese release rate in artificial saliva and sweat is much lower than the acceptable daily intake standard; the stainless steel can be used as a biomedical material; and the metal toxicity risk is inexistent. The high-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) is very good in flexibility and plasticity, can meet the processing requirements of fine parts such as jewelries and the like, and is superior to chromium-nickel austenite antibacterial stainless steel of 316 L and the like in overall performance.

The invention relates to a high-build epoxy coal tar pitch anticorrosive coating and a preparation method thereof. The preparation method comprises the following steps of: adding dimethylbenzene, n-butyl alcohol, butanone, coal tar pitch resin liquid, toughened resin, precipitated barium sulfate, silk mica powder, talc powder, a hoof-joint type rheological control aid, a coupling agent 01, a CibaEFKA3650 aid, an organic defoaming agent and poly organic carboxylate into bisphenol A type epoxy resin with medium molecular weight, stirring, dispersing at a high speed, and grinding into a component A; stirring phenolic ammonia, an accelerator, ethanol and a CibaTINUVIN 460 light stabilizer to form a component B; and uniformly mixing the component A and the component B in a ratio of 10:1. The high-build epoxy coal tar pitch anticorrosive coating has certain toughness, and has excellent adhesion, high microbial corrosion resistance, long construction operating period and certain light ageing resistance when applied to prestressed concrete cylinder pipe (PCCP) exterior walls.

The invention discloses a method for improving microbial corrosion resistance of concrete. The method comprises the following steps: immersing concrete with built-in steel bars in a copper lactate electrolyte of a direct-current electrolysis device, and performing direct-current electrolysis by taking the steel bars in the concrete as a cathode; and cleaning and blow-drying the electrolyzed concrete, soaking the concrete in a dopamine solution and a 1-dodecanethiol solution for coating sequentially, and taking the concrete out for cleaning and blow drying. The microbial corrosion resistance ofthe concrete is improved by depositing copper and copper oxide on the surface of concrete; by addition of a composite coating to the surface of deposit, hydrophobicity of the test piece surface is improved, leaching of copper ions is reduced, and the service life of the deposit is prolonged. The electrolyte prepared from copper nitrate instead of copper sulfate prevents the influence of sulfate ions on performance of the concrete during electrodeposition. The concrete electrodeposition method and device have the advantages of simple structure, simple and convenient operation, good anticorrosion effect, high practicability and wide applicability.

The invention relates to the field of copper-containing microbiological corrosion resistant pipeline steel, in particular to a copper precipitation method for economical copper-containing microbiological corrosion resistant pipeline steel. The economical copper-containing microbiological corrosion resistant pipeline steel consists of the following chemical components in percentage by weight: greater than 0% and smaller than 0.1% of C, greater than 0% and smaller than 0.50% of Si, greater than 0% and smaller than 2.0% of Mn, smaller than 0.003% of S, smaller than 0.008% of P, greater than 0.5%and smaller than 4.0% of Cu, greater than 0% and smaller than 2.0% of Ni, smaller than 1.0% of Mo, smaller than 1.0% of Cr, smaller than 0.1% of Nb, smaller than 0.1% of V, smaller than 0.1% of Ti, smaller than 0.1% of Al, smaller than 0.2% of Ce, and the balance of Fe and inevitable impurities. Copper-containing pipeline steel adopting the components is subjected to relaxation treatment after being subjected to hot-rolling, so that solid solution Cu in the steel is precipitated in an induction form, and therefore, the cost decreasing and benefit increasing purposes are realized while relatively good microbiological corrosion resistance is achieved. A production process for the copper-containing microbiological corrosion resistant pipeline steel treated by the method does not need extra aging thermal treatment.

The invention aims to provide a pipeline steel with resistance to microbiological corrosion on the premise of guaranteeing the advantages of conventional pipeline steel so as to substantially reduce the possibility of microbiological corrosion from material source. The pipeline steel provided by the invention comprises the following chemical components by weight: 0.020 to 0.030% of C, 0.10 to 0.15% of Si, 0.9 to 1.1% of Mn, 1.0 to 2.0% of Cu, 0.30 to 0.35% of Ni, 0.30 to 0.35% of Mo, 0.30 to 0.35% of Cr, 0.045 to 0.055% of Nb, 0.015 to 0.025% of V, no more than 0.0015% of S and no more than 0.0050% of P, with the balance being Fe. The elemental Cu is added into the pipeline steel, so after aging treatment, the pipeline steel has greatly improved strength and excellent microbiological corrosion resistance.

Disclosed are a water-soluble metal-processing agent and a coolant both of which have excellent microbial deterioration resistance and are less likely to go rotten, a method for preparing the agent or the coolant, and a metal processing method. The water-soluble metal-processing agent or the coolant comprises an N,N,N′,N′-tetraalkyldiamine compound. The metal processing method is characterized by processing a metal of interest by using the water-soluble metal-processing agent or the coolant.

The invention discloses stainless steel, a preparation method and application, and belongs to the technical field of stainless steel materials. The stainless steel comprises the following chemical components in percentage by weight: C not more than 0.03%, Si not more than 0.5%, 8.0-10.0% of Ni, 17.0-19.0% of Cr, S not more than 0.003%, P not more than 0.003%, 3.5-5.0% of Cu, 0.10-0.30% of N, rare earth elements not more than 0.10%, and the balance of Fe and inevitable impurities. The stainless steel has both broad-spectrum antibacterial function and excellent microbiological corrosion resistance. The stainless steel can be widely applied to stainless steel equipment and parts, needing to resist microbiological corrosion, in building decoration, kitchens, sanitary installations and facilities, household appliances, traffic transportation, industrial pipes, water treatment equipment and ocean engineering.

The invention discloses a microbial corrosion device for simulating hydraulic concrete under different conditions. The device comprises an upper-layer water storage tank and a lower-layer water storage tank. N first partition plates are arranged in the upper-layer water storage tank in parallel in a first direction to divide the upper-layer water storage tank into N+1 first unit structures. Each first unit structure is divided into a reaction area and a transition area by a second partition plate in the upper-layer water storage tank in a second direction. N third partition plates are arrangedin the lower-layer water storage tank in parallel in the first direction to divide the lower-layer water storage tank into N+1 second unit structures. Grooves for placing concrete pieces under test are formed in the reaction areas. Each transition area is communicated to a water inlet of the corresponding reaction area, and a water outlet of each reaction area is communicated to the second unit structure at the corresponding position in the lower-layer water storage tank. A water outlet of each second unit structure is communicated with a water inlet of the transition area of the first unit structure at the corresponding position, and a circulating water pump is arranged at the water outlet of each second unit structure.

The invention relates to a sulfate reducing bacteria microbe corrosion method of magnesium alloy, for resolving the microbe corrosion problem of magnesium alloy and combining the microbe cultivation technique and microbe corrosion technique of solid culture medium to provide a novel magnesium alloy microbe corrosion method based on solid culture medium. The method comprises (1) processing and disinfecting sample, (2) arranging and disinfecting a solid culture medium, (3) cultivating and activating bacterial, (4) corroding paster. The invention optimizes the components of electrolyte to highlight the bacterial performance in the corrosion process of magnesium alloy, and compares the electrode surface corrosion morphology with bacterial and without bacterial, to provide the reference for magnesium alloy microbe corrosion mechanism research. The inventive method is suitable for magnesium alloy microbe corrosion research.

The invention relates to a surface anti-bacterial structure of a substrate used in a space environment and a preparation method thereof, and belongs to the technical field of metal nanometer ion functional materials and application thereof. Titanium or titanium alloy is used as the substrate. By using a voltage-stabilization anodic oxidation method, a titanium dioxide nanotube array is prepared onthe surface of the titanium and titanium alloy. The method is simple, the efficiency of generating titanium dioxide nanotubes is high, the structure of the nanotubes obtained by using the method is regular, the specific surface area of the titanium and titanium alloy is increased, and therefore, the ability of the structure to support anti-bacterial ions is enhanced. Through an electron beam evaporation deposition technology, organosilicone-coated silver particles are deposited into the titanium dioxide nanotubes, and on the premise without affecting the mechanical property of the titanium and titanium alloy substrate, the microbiological corrosion resistance of the titanium and titanium alloy in the space environment is improved.

The invention discloses a steel surface corrosion-resistant hydrophobic treatment fluid for marine equipment. The treatment fluid is characterized by comprising the following components at respective concentration: a solvent of a mixture of N-polyvinylpyrrolidone and epoxy resin, nano-poly tetrafluoroethylene with the concentration of 3.0-4.0g / L, nano-graphene with the concentration of 1.5-2.5g / L, and nano-silicon carbide with the concentration of 0.5-1.5g / L. The present invention provides a treatment method using the steel surface corrosion-resistant hydrophobic treatment fluid for marine equipment. The treatment method is as below: forming a randomly distributed bionic texture by using the thermal shock effect generated by micro-arc plasma in a solution; and then forming a wear-resistant corrosion-resistant hydrophobic layer on the steel surface by utilizing a sol-gel method. The invention solves the problems of seawater corrosion and marine microbial corrosion caused by direct contact of the steel surface with water; the steel parts can be processed directly; and the process is simple, and reduces cost.

The invention relates to a water-based coating for a pipeline. The water-based coating for the pipeline comprises the following components: hydroxylated fiber resin, modified phenolic resin, asphalt, alkyd emulsion, carboxylic dibasic ester, isooctyl acrylate, man-made glass fiber, nano-powder, talcum powder, iron titanium powder, chromium oxide green, sodium hexametaphosphate, a methylalkylpolysiloxane solution, dodecyl mercaptan, a bactericide, a rust inhibitor, 1, 2-propylene glycol, additives and deionized water. The water-based coating for the pipeline has the following beneficial effects that the coating is good in adhesion, less prone to shedding and long in service life; furthermore, a preservative is added in the coating, so that the water-based coating can effectively prevent natural corrosion and microbial corrosion of the pipeline caused by iron bacteria.

The invention discloses an environment-friendly power sheath and a preparation method thereof. The environment-friendly power sheath is prepared from the following raw materials in parts by weight: 40-45 parts of polylactic acid, 15-25 parts of bacterial cellulose, 15-20 parts of polyvinyl alcohol, 10-20 parts of hydroxyethyl cellulose, 10-15 parts of ethylene-propylene rubber, 10-15 parts of polycarbonate, 10-15 parts of bamboo filler, 10-15 parts of starch ether, 12-15 parts of silane coupling agent, 8-10 parts of polyhydroxybutyrate, 5-10 parts of glass fibers, 5-10 parts of brominated flame retardant and 5-10 parts of chitin, 0.5 part of chromium carbide powder, 0.5 part of borax and 0.5 part of talcum powder. The power sheath disclosed by the invention is degradable, green and environment-friendly; the power sheath is resistant to acidic / basic microbial corrosion and is good in tensile and flexural strength and high in flame retardance, thereby being applicable to electric power application in severe environments; the preparation method is simple and is easy in operation.

The invention aims to provide a stainless steel for oil well pipes with microbiological corrosion resistance and a preparation method thereof, in order to reduce the risk of microbiological corrosionat the aspect of materials. The stainless steel comprises the following chemical components by weight percent: less than or equal to 0.03% of C, 0.1-0.3% of Si, less than or equal to 0.5% of Mn, 12.0-14.0% of Cr, 4.0-6.0% of Ni, 1.5-2.5% of Mo, 1.0-2.0% of Cu, 0.1-0.8% of Ga, 0.1-0.2% of Ce, less than or equal to 0.02% of S, less than or equal to 0.03% of P and the balance of Fe and inevitable impurities. According to the invention, a defined amount of Cu, Ga and rare earth element Ce are compounded and added on the basis of traditional super martensitic stainless steel components for oil wellpipes, so that the stainless steel can acquire higher toughness and excellent property for resisting against hydrogen sulfide stress corrosion cracking under the synergistic effect of the three elements, and meanwhile, the stainless steel has excellent microbiological corrosion resistance and can be applied to the production of steel used for oil well pipes.

The invention discloses a method for spraying a coating and a killing coating on the surface of an oil tank and for jointly preventing corrosion, wherein a metal corrosion prevention coating is sprayed on the metal surface of an oil tank base body at first; and next, the killing coating taking natural asphalt-improved epoxy resin as a base body, taking polyamide or isocyanate as a cross-linking agent, and taking quaternary ammonium or styrene-acrylic isothiazolinone as a killing agent, is coated on the surface of the sprayed metal coating. According to the method for spraying the coating and the killing coating on the surface of the oil tank and for jointly preventing the corrosion, due to the metal coating and the killing coating, double protections are formed for the inner wall of a tank body; and therefore, the corrosion of microorganism in a water accumulation area on the bottom of the oil tank is prevented; the even corrosion rate and the hole corrosion tendency are effectively decreased; the corrosion prevention performance in a sedimentation water area of the oil tank is excellent; and the service life of the oil tank is prolonged.