Stainless steels such as STS 304,316 and 630 are frequently used as shaft materials in small fiber reinforced polymer(FRP) fishing boats.If the shaft material is exposed to a severely corrosive environment such as sea...Stainless steels such as STS 304,316 and 630 are frequently used as shaft materials in small fiber reinforced polymer(FRP) fishing boats.If the shaft material is exposed to a severely corrosive environment such as seawater,it should be protected using appropriate methods.The impressed current cathodic protection was used to inhibit corrosion in shaft materials.In anodic polarization,passivity was remarkably more evident in STS 316 stainless steel than in STS 304 and STS 630.The pitting potentials of STS 304,316,and 630 stainless steels were 0.30,0.323,and 0.260 V,respectively.The concentration polarization due to oxygen reduction and activation polarization due to hydrogen generation were evident in the cathodic polarization trends of all three stainless steeds.STS 316 had the lowest current densities in all potential ranges,and STS 630 had the highest.Tafel analysis showed that STS 316 was the most noble in the three.In addition,the corrosion current density was the lowest for STS 316.展开更多
Cathodic protection is an effective electrochemical technique for preventing corrosion of metallic structures, for large structures like piles network impressed current cathodic protection (ICCP) system is usually pre...Cathodic protection is an effective electrochemical technique for preventing corrosion of metallic structures, for large structures like piles network impressed current cathodic protection (ICCP) system is usually preferred. The main aim of this study is to obtain the optimum protection potential that would provide a full cathodic protection for steel piles net-work immersed in sea water at Al-Zubair harbor. The effect of one immeasurable factor (path of anode (χ1)) and two measurable factors (position of anode (χ2) and voltage of power supply (χ3)) on protection potential are studied. Each factor has three different levels (high, medium, and low). Twenty-seven experiments were conducted based on a full factorial design of experiments. The results show that, a sufficient protection for three cathodes can be provided through the electrical circuit connecting them within the appropriate geometric shape.The protection potential is icreased with increasing the voltage of power supply and decreasing of distance between the anode and cathodes (piles network).展开更多
埋地管道的腐蚀防护工程对处于长期不间断运行状态的多段线长距离管道至关重要,以外加电流阴极保护(ICCP,Impressed Current Cathodic Protection)为主的腐蚀防护方案在埋地管道工程中的应用广泛,能有效抑制金属构件在土壤中的腐蚀削弱...埋地管道的腐蚀防护工程对处于长期不间断运行状态的多段线长距离管道至关重要,以外加电流阴极保护(ICCP,Impressed Current Cathodic Protection)为主的腐蚀防护方案在埋地管道工程中的应用广泛,能有效抑制金属构件在土壤中的腐蚀削弱。针对ICCP在埋地管道工程中的应用进行理论分析,主要涉及金属腐蚀原理及管道防腐蚀基本方法、腐蚀检测过程分析、管道锈蚀后的再保护、外加电流法在管道工程中的应用以及局限性分析、保障管道防护工程安全性和完整性的针对措施,并对ICCP的管道工程应用要点进行了归纳总结。展开更多
盐类物质、水和泥沙等腐蚀介质会加快海洋环境对金属构架物的腐蚀,严重影响港口、石油平台等海洋工程中金属结构的性能。为了减少复杂海洋环境对金属构架的腐蚀破坏,工程上通常采用外加电流阴极保护法(ICCP,Impressed current cathodic ...盐类物质、水和泥沙等腐蚀介质会加快海洋环境对金属构架物的腐蚀,严重影响港口、石油平台等海洋工程中金属结构的性能。为了减少复杂海洋环境对金属构架的腐蚀破坏,工程上通常采用外加电流阴极保护法(ICCP,Impressed current cathodic protection)的腐蚀防护方案对金属构架进行保护。针对ICCP海洋腐蚀防护工程的应用,从电解池组成的角度进行梳理分析,对电解质、外加电源和阴阳电极层面涉及的关键问题进行了总结。展开更多
文摘Stainless steels such as STS 304,316 and 630 are frequently used as shaft materials in small fiber reinforced polymer(FRP) fishing boats.If the shaft material is exposed to a severely corrosive environment such as seawater,it should be protected using appropriate methods.The impressed current cathodic protection was used to inhibit corrosion in shaft materials.In anodic polarization,passivity was remarkably more evident in STS 316 stainless steel than in STS 304 and STS 630.The pitting potentials of STS 304,316,and 630 stainless steels were 0.30,0.323,and 0.260 V,respectively.The concentration polarization due to oxygen reduction and activation polarization due to hydrogen generation were evident in the cathodic polarization trends of all three stainless steeds.STS 316 had the lowest current densities in all potential ranges,and STS 630 had the highest.Tafel analysis showed that STS 316 was the most noble in the three.In addition,the corrosion current density was the lowest for STS 316.
文摘Cathodic protection is an effective electrochemical technique for preventing corrosion of metallic structures, for large structures like piles network impressed current cathodic protection (ICCP) system is usually preferred. The main aim of this study is to obtain the optimum protection potential that would provide a full cathodic protection for steel piles net-work immersed in sea water at Al-Zubair harbor. The effect of one immeasurable factor (path of anode (χ1)) and two measurable factors (position of anode (χ2) and voltage of power supply (χ3)) on protection potential are studied. Each factor has three different levels (high, medium, and low). Twenty-seven experiments were conducted based on a full factorial design of experiments. The results show that, a sufficient protection for three cathodes can be provided through the electrical circuit connecting them within the appropriate geometric shape.The protection potential is icreased with increasing the voltage of power supply and decreasing of distance between the anode and cathodes (piles network).
文摘埋地管道的腐蚀防护工程对处于长期不间断运行状态的多段线长距离管道至关重要,以外加电流阴极保护(ICCP,Impressed Current Cathodic Protection)为主的腐蚀防护方案在埋地管道工程中的应用广泛,能有效抑制金属构件在土壤中的腐蚀削弱。针对ICCP在埋地管道工程中的应用进行理论分析,主要涉及金属腐蚀原理及管道防腐蚀基本方法、腐蚀检测过程分析、管道锈蚀后的再保护、外加电流法在管道工程中的应用以及局限性分析、保障管道防护工程安全性和完整性的针对措施,并对ICCP的管道工程应用要点进行了归纳总结。
文摘盐类物质、水和泥沙等腐蚀介质会加快海洋环境对金属构架物的腐蚀,严重影响港口、石油平台等海洋工程中金属结构的性能。为了减少复杂海洋环境对金属构架的腐蚀破坏,工程上通常采用外加电流阴极保护法(ICCP,Impressed current cathodic protection)的腐蚀防护方案对金属构架进行保护。针对ICCP海洋腐蚀防护工程的应用,从电解池组成的角度进行梳理分析,对电解质、外加电源和阴阳电极层面涉及的关键问题进行了总结。
