(北京科技大學(xué) 材料物理系，北京 100083)
摘 要: 黃銅表面在氨水中腐蝕或應(yīng)力腐蝕時(shí)形成脫鋅層，由此產(chǎn)生一個(gè)附加拉應(yīng)力。實(shí)驗(yàn)結(jié)果表明，脫鋅層拉應(yīng)力σp隨黃銅試樣中氫含量w(H)的升高而線性升高，即σp/MPa=13.2+5.2×10-6w(H)。黃銅中的氫含量達(dá)到3×10-6時(shí)，可使黃銅在氨水中的應(yīng)力腐蝕敏感性升高10%。氫促進(jìn)黃銅應(yīng)力腐蝕的原因是氫含量的增大會(huì)引起脫鋅層拉應(yīng)力的增大。
關(guān)鍵字: 黃銅；氫；應(yīng)力腐蝕；脫鋅層引起應(yīng)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
