| The seawater is a medium that is particularly corrosive to metal materials.In the marine engineering field,various kinds of metal materials are used for the requirements of structure and function.The galvanic corrosion caused by these different metal materials in contact with each other in seawater will pose a serious threat to the safety and reliability of the equipment.Therefore,it is of great significance to study the galvanic corrosion behavior of metallic materials in the marine environment.In this thesis,the galvanic corrosion behavior of 2205 duplex stainless steel and B10 copper nickel alloy in marine engineering was studied by using corrosion weightlessness,electrochemical and surface analysis techniques.The influence of two factors on the galvanic corrosion behavior of 2205/310 was investigated.The use of Q235 as a sacrificial anode for reducing the rate of galvanic corrosion of 2205/310 was investigated.The main work and conclusions are as follows:(1)For 2205 duplex stainless steel and B10 copper-nickel alloy,the open circuit potential sequence in seawater is 2205>B10.After coupling in seawater,B10 will be the coupling anodic and its corrosion rate will be accelerated,while 2205 will be protected as the coupling cathode;(2)The galvanic effect of 2205/810 in seawater ranges from 1.43 to 1.51 under the temperature conditions seted in this experiment,and the galvanic effect increases with temperature rises.The ratio of cathode/anode(Ac/Aa)has a significant effect on galvanic corrosion behavior,the density of coupling anode B10 continues to increase with the ratio of Ac/Aa increases;(3)The use of Q235 as the sacrificial anode has a significant protective effect on 2205/B10.The corrosion rate of the anode metal B10 is 0.03 mm/a before the Q235 is added,while the B10 corrosion rate reduces to 0.01 mm/a after applying a sacrificial anode Q235 to form a complex coupling 2205/B10/Q235,which is less than its self-corrosion rate. |
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