A dissolvable alloy, the chemical composition of which comprises aluminum between 2.5% and 9%; zinc between 0.1% and 1.5%; iron between 0.01% and 3%; and magnesium the remainder, such alloy being usable in tools and components of the petroleum industry.

A dissolvable alloy, the chemical composition of which comprises aluminum between 2.5% and 9%; zinc between 0.1% and 1.5%; iron between 0.01% and 3%; and magnesium the remainder, such alloy being usable in tools and components of the petroleum industry.

The disclosure discloses a magnesium alloy for wheels, comprising in mass percentage: Al: 2-3.0 wt. %; Zn: 0.5-1.0 wt. %; Mn: 0.3-0.5 wt. %; Ce: 0.15-0.3 wt. %; La: 0.05-0.1 wt. %, the balance is Mg. The magnesium alloy of the present invention takes Al element and Mn element as main alloying elements, supplemented by trace Ce and La elements as alloying process, and the nano-scale Mn-rich precipitated phase obtained during homogenization and the segregation of rare earth elements Ce and La at the interface and grain boundary of Mn-rich precipitated phase are used to inhibit the coarsening during extrusion and forging, so as to improve the strength and plastic deformation ability of the alloy.

The disclosure discloses a magnesium alloy for wheels, comprising in mass percentage: Al: 2-3.0 wt. %; Zn: 0.5-1.0 wt. %; Mn: 0.3-0.5 wt. %; Ce: 0.15-0.3 wt. %; La: 0.05-0.1 wt. %, the balance is Mg. The magnesium alloy of the present invention takes Al element and Mn element as main alloying elements, supplemented by trace Ce and La elements as alloying process, and the nano-scale Mn-rich precipitated phase obtained during homogenization and the segregation of rare earth elements Ce and La at the interface and grain boundary of Mn-rich precipitated phase are used to inhibit the coarsening during extrusion and forging, so as to improve the strength and plastic deformation ability of the alloy.

A swellable packer assembly that includes a mandrel, a sealing element disposed about a least a portion of the mandrel, and a degradable metal coating disposed about at least a portion of an outer surface of the sealing element. The degradable metal coating fluidly isolates the portion of an outer surface of the sealing element from an exterior of the coating and the sealing element is formed of a material responsive to exposure to a fluid in a wellbore to radially expand from the mandrel. The degradable metal coating is selectively removable from the mandrel downhole so as to expose the sealing element to the fluid in the wellbore.

A swellable packer assembly that includes a mandrel, a sealing element disposed about a least a portion of the mandrel, and a degradable metal coating disposed about at least a portion of an outer surface of the sealing element. The degradable metal coating fluidly isolates the portion of an outer surface of the sealing element from an exterior of the coating and the sealing element is formed of a material responsive to exposure to a fluid in a wellbore to radially expand from the mandrel. The degradable metal coating is selectively removable from the mandrel downhole so as to expose the sealing element to the fluid in the wellbore.

A corrodible downhole article includes a magnesium alloy, including: a strengthening metallic element comprising at least one of Al, Zn, Mn, Cu and Ag and at least one corrosion promoting element in an amount of 0.01-10 wt % in total. The alloy has a corrosion rate of at least at least 75 mg/cm.sup.2/day in 15% KC1 at 93° C. and a 0.2% proof strength of at least 100MPa when tested using standard tensile test method ASTM B557-10. In particular, the magnesium alloy includes 5-10 wt % Al, and at least one of Zn and Mn in a total amount ranging from 0 to 1.0 wt %.

A corrodible downhole article includes a magnesium alloy, including: a strengthening metallic element comprising at least one of Al, Zn, Mn, Cu and Ag and at least one corrosion promoting element in an amount of 0.01-10 wt % in total. The alloy has a corrosion rate of at least at least 75 mg/cm.sup.2/day in 15% KC1 at 93° C. and a 0.2% proof strength of at least 100MPa when tested using standard tensile test method ASTM B557-10. In particular, the magnesium alloy includes 5-10 wt % Al, and at least one of Zn and Mn in a total amount ranging from 0 to 1.0 wt %.

An Mg—Li alloy contains more than 10.50% by mass and not more than 16.00% by mass of Li, not less than 2.00% by mass and not more than 15.00% by mass of Al, not less than 0.03% by mass and less than 1.10% by mass of Mn, impurities, and the balance of Mg. The impurities contain Fe at a concentration of 15 ppm or less. The alloy may optionally contain M, which is at least one element selected from the group consisting Ca, Zn, Si, Y, and rare earth metal elements with atomic numbers of 57 to 71.

An Mg—Li alloy contains more than 10.50% by mass and not more than 16.00% by mass of Li, not less than 2.00% by mass and not more than 15.00% by mass of Al, not less than 0.03% by mass and less than 1.10% by mass of Mn, impurities, and the balance of Mg. The impurities contain Fe at a concentration of 15 ppm or less. The alloy may optionally contain M, which is at least one element selected from the group consisting Ca, Zn, Si, Y, and rare earth metal elements with atomic numbers of 57 to 71.