论文部分内容阅读
采用化学成分、宏观形貌、金相组织、微观及能谱分析等方法,分析了某船舶海水管路中的B10铜镍环的腐蚀失效原因。结果表明,在该铜镍环的腐蚀坑底部、冲刷腐蚀区、冲蚀坑内以及腐蚀穿孔的减薄区,都普遍存在着“冰糖块”状的晶间腐蚀形貌;优先腐蚀的晶界形成一个回路,被包围的晶粒发生了明显的脱镍和溶解;表层腐蚀产物及冲刷腐蚀区暴露出的晶粒上都存在S。该B10铜镍环的腐蚀破坏过程是含硫介质中的晶间腐蚀、脱成分腐蚀和冲刷腐蚀综合作用的结果。
The chemical composition, macroscopic morphology, microstructure, microstructure and energy spectrum analysis were used to analyze the corrosion failure reasons of B10 copper-nickel ring in a ship’s seawater pipeline. The results show that intergranular corrosion morphology of “ice-lump” shape is prevalent in the bottom of corrosion pits, erosion area, erosion pits and corrosion thinning area of the copper-nickel ring. Preferential corrosion The formation of a circle, surrounded by the crystal grain was obvious de-nickel and dissolved; surface corrosion products and erosion of the exposed areas of the grain are present on the S. The corrosion and destruction process of the B10 copper-nickel ring is the result of intergranular corrosion, de-component corrosion and erosion corrosion in the sulfur-containing medium.