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海船船体采用阴极保护与涂料(包括长效防污涂料)联合防护,可以延长海船坞修间隔期,提高航运率,具有明显的经济效益,但必须正确地选择和控制保护电流密度。一、船体在海水中电化学腐蚀船体的腐蚀速度与所处的海洋环境有关,一般可分为三个部分。大气部分:腐蚀速度约0.03～0.06毫米/年;干湿交替部分:腐蚀速度约0.3～0.6毫米/年;船底部分:腐蚀速度约0.1～0.15毫米/年。据日本造船研究协会对28艘油轮的调查,船体平均腐蚀速度为0.205毫米/年;有的航行二年腐蚀深度己达2～5毫米,并出现直径为10～20毫米的蚀坑。我国制造的
The combination of cathodic protection and coating (including long-term anti-fouling paint) protection of marine hulls can prolong the interval between sea docks and improve the shipping rate with obvious economic benefits. However, the protection current density must be properly selected and controlled. First, the hull electrochemical corrosion in the sea The corrosion rate of the hull and the marine environment in which the general can be divided into three parts. Atmospheric parts: corrosion rate of about 0.03 ~ 0.06 mm / year; alternating wet and dry parts: corrosion rate of about 0.3 ~ 0.6 mm / year; bottom part: corrosion rate of about 0.1 ~ 0.15 mm / year. According to a survey conducted by the Japan Society of Shipbuilding Research on 28 oil tankers, the average corrosion rate of the hull was 0.205 mm / year; in some cases, the depth of corrosion was 2 to 5 mm in depth in two years and pits of 10 to 20 mm in diameter were observed. Made in China