(北京科技大学 材料物理系，北京 100083)
摘 要: 黄铜表面在氨水中腐蚀或应力腐蚀时形成脱锌层，由此产生一个附加拉应力。实验结果表明，脱锌层拉应力σp随黄铜试样中氢含量w(H)的升高而线性升高，即σp/MPa=13.2+5.2×10-6w(H)。黄铜中的氢含量达到3×10-6时，可使黄铜在氨水中的应力腐蚀敏感性升高10%。氢促进黄铜应力腐蚀的原因是氢含量的增大会引起脱锌层拉应力的增大。
关键字: 黄铜；氢；应力腐蚀；脱锌层引起应力
（Department of Materials Physics， University of Science and Technology Beijing，Beijing 100083， China）
Abstract:Dezincification layer is formed on brass during corrosion or stress corrosion cracking (SCC) in ammonia solution, and an additive stress is induced in the same time. The stress induced by dezincification layer rises directly with increasing hydrogen content in specimen. The presence of hydrogen increases susceptibility of brass to SCC in ammonia solution，which shows that hydrogen increases the stress induced by dezincification layer.
Key words: brass; hydrogen; SCC; stress induced by dezincification layer
