不同Mn含量Cu-Mn合金熔覆层的腐蚀特性

Corrosion Characteristics of Cu-Mn Cladding Layers with Different Mn Contents

摘要:

为研究不同Mn含量Cu-Mn合金熔覆层的腐蚀特性和防污性能，利用激光熔覆技术制备了成分均匀、稀释率低的Cu-Mn合金熔覆层。采用电化学测试、盐雾腐蚀实验、腐蚀形貌观察及铜离子释放试验对3种不同Mn含量的Cu-Mn合金熔覆层在3.5%（质量分数）NaCl溶液中的腐蚀特性进行研究，重点研究了Mn对腐蚀产物和铜离子释放率的影响。结果表明：在电化学测试中，随着Mn含量增多，熔覆层的耐腐蚀性降低。盐雾腐蚀实验中，随着Mn含量的增多，Cu-Mn合金熔覆层腐蚀程度加深，平均质量损失增大。对电解腐蚀后的熔覆层样品进行腐蚀形貌观察，Mn含量高的Cu-Mn合金样品生成的腐蚀产物较低Mn含量的样品更疏松，裂纹孔洞数量多，腐蚀产物更易剥落。铜离子释放试验中，3种Mn含量合金熔覆层样品都可以抑制海洋生物生长，且Mn含量越高，铜离子渗出率越大，在防污材料方面有良好的应用前景。

Abstract:

To investigate the corrosion characteristics and anti-fouling properties of Cu-Mn cladding layers with different Mn contents, the laser cladding technique was used to prepare Cu-Mn cladding layers with homogeneous composition and low dilution rate. Electrochemical tests, salt spray corrosion experiments, corrosion morphology observations, and copper ion release tests were conducted to investigate the corrosion characteristics of Cu-Mn cladding layers with different Mn contents in 3.5wt% NaCl solution. The effect of Mn on corrosion products and copper ion release rate was particularly studied. Results show that the corrosion resistance of cladding layers is decreased with increasing the Mn content during the electrochemical tests. In the salt spray corrosion experiments, the corrosion degree of the Cu-Mn cladding layer is deepened with increasing the Mn content, and the average mass loss is increased. The corrosion morphology of cladding layers after electrolytic corrosion was observed. Compared with those of Cu-Mn cladding layer with low Mn content, the corrosion products generated from Cu-Mn cladding layer with high Mn content have more sparse structure, the number of crack holes is larger, and the corrosion products are easier to peel off. In the copper ion release test, all cladding layers can inhibit the growth of sea creatures. The higher the Mn content, the greater the copper ion release rate, presenting great application potential in anti-fouling materials.