ZQMn12-8-3-2高锰铝青铜在2.4%NaCl溶液中的空蚀行为  

Cavitation Erosion Behavior of ZQMnl2-8-3-2 Manganese Aliuminium Bronze in 2.4%NaCl Solution

作　　者：董立峰[1] 

机构地区：[1]燕山大学材料科学与工程学院,秦皇岛066004

出　　处：《腐蚀科学与防护技术》2011年第6期485-489,共5页Corrosion Science and Protection Technology

摘　　要：利用磁致伸缩空蚀试验饥研究了ZQMn12-8-3-2高锰铝青铜在2.44%NaCl溶液中的空蚀行为.结果表明:空蚀作用致使ZQMn12-8-3-2高锰铝青铜的自腐蚀电位正移.在腐蚀与空蚀的交互作用中,力学因素起了至关重要的作用,腐蚀因素作用相对较小、腐蚀因素作用相对较小.微裂纹首先在a/k相界的a相部分形成;随着空蚀的进行,这些微裂纹在a相内合并展导致a相失重,K相也随之剥离基体.空蚀微裂纹易于横向扩展而向深度方向受阻.试样表面均匀剥落,未出现大的海绵状的空蚀坑.The cavitation erosion （CE） behavior of ZQMn12-8-3-2 manganese aliuminium bronze in 2.4% NaCl solution was investigated by using a magnetostrictive-induced cavitation facility. The micrographs of damaged surfaces were observed by scanning electron microscope （SEM）. The role of corrosion was analyzed by using polarization curve. The results showed that cavitation shifted the free corrosion potential of the alloy in positive direction. It was confirmed that the erosion played an important role in the synergistic effect of erosion and corrosion by cavitation erosion, and only a small fraction of the damage arose from electrochemical corrosion. SEM observation of eroded specimen indicated that the cavitation microcracks initiated in the α phase adjacent to the phase. They propagated and connected with each other within α phases, resulted in the removal of α phases and detachment of the κ phase from the matrix in the subeequent test period. The microcracks tended to propagate parallelly to the eroded surfaces.

关 键 词：空蚀 高锰铝青铜 NACL溶液 交互作用 加工硬化 

分 类 号：TG174[金属学及工艺—金属表面处理]