Investigations of the corrosion damage process of the brazed joint AISI 304L/BNi-2

Investigations of the corrosion damage process of the brazed joint AISI 304L/BNi-2
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AISI 304L/BNi-2钎焊接头腐蚀损伤过程研究

DOI:
10.1016/j.rinp.2018.12.074
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发表时间:
2019
期刊:
影响因子:
5.3
通讯作者:
Eilers
Eilers
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tillmann;Walther;Schmiedt;Wojarski;Eilers

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生产汽车排气系统热交换器最常用的材料组合之一是真空钎焊AISI 304 L/BNi-2组件。为了模拟在使用过程中冷凝物腐蚀对这些部件的影响,本研究中使用了用于测试金属材料对废气中冷凝物腐蚀的抵抗力的成熟测试程序VDA 230-214。在长达6周的测试持续时间内,观察并检查了各种腐蚀机制的形成和进展。由于铬硼化物的形成和镍含量的降低,腐蚀侵蚀开始于基底金属侧的扩散区。在第4周和第5周之间,观察到最大的材料去除,这与承重区域的直径从6.5 mm减小到5.8 mm一致。在这方面,在6周的腐蚀测试之后,极限拉伸强度从253.3MPa下降到147.8MPa。
One of the most frequently used material combinations to produce heat exchangers for automotive exhaust systems are vacuum brazed AISI 304L/BNi-2 components. In order to simulate the influence of condensate corrosion on such parts during service, the well-established test procedure for testing the resistance of metallic materials to condensate corrosion in exhaust gas, VDA 230-214, is used in this study. For a test duration of up to 6 weeks, miscellaneous corrosive mechanisms were observed and examined concerning their formation and progression. The corrosive attack starts at the diffusion zone on the base metal side due to the formation of chromium borides and the reduced nickel content. Between week 4 and 5, the greatest material removal was observed, which goes in line with a diameter reduction from 6.5 mm down to 5.8 mm of the load-bearing area. In this regard, the ultimate tensile strength drops down from 253.3 MPa to 147.8 MPa after 6 weeks of corrosive testing.
DOI: 10.1111/ffe.12902
发表时间: 2018-08
影响因子: 3.7
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