A ternary dissolvable Mg-Ni-Cu alloy possessing super-high corrosion rate for the fabrication of fracturing plugging tools

Abstract

Dissolvable magnesium alloys are receiving widespread attention recently, which are often designed by impurity elements alloying such as Ni and Cu. Herein, a ternary Mg-8Ni-4.2Cu (wt.%) alloy is firstly reported in which Ni and Cu are regarded as the main components. This alloy possesses a super-high corrosion rate of 303.1 mg·cm−2·h−1 at 93 ℃ in 3 wt% KCl solutions, which was resulted from high potential difference between the secondary phases and Mg matrix, and the uniform distribution of secondary phases. This alloy also attains the decent mechanical properties, i.e., ultimate tensile strength (UTS) of 331 MPa and ultimate compressive strength (UCS) of 502 MPa, which are mainly from secondary phases strengthening, grain refinement, and dislocation strengthening. This work provides a qualified material selection for fabricating fracturing plugging tools.