US 11,111,595 B2 · Apparatus for electrolytic etching and dissolution and method for extracting metal compound particles

Abstract

The object of the present invention is such that a surface exchange of metal fine particles by Cu ions, or the like is inhibited in order to prevent formation of Artificial CuS or the like, in extraction and analysis of the metal fine particles (inclusions and precipitates) in a metal material by electrolytic corrosion in a solvent-based electrolytic solution, without significantly changing conventional extraction and analysis methods, and such that the metal deposited on the cathode is actively attached to the cathode so that the deposited metal does not become a contamination source. An apparatus for electrolytic etching and dissolution and an extraction method for separation and extraction of metal compound particles in a metal material, wherein at least a part of the cathode comprises a material consisting of a metal M′ whose Δ defined by the following formula is 10 or more, and the apparatus comprises an electrolytic cell for containing an electrolytic solution comprising a chemical agent that forms a complex containing the metal M′ and a nonaqueous solvent, Δ = pKsp ⁡ [ M ′ ⁢ x ′ ⁢ Ay ′ ] - pKsp ⁡ [ MxAy ] = ( - log 10 ⁢ Ksp ⁡ [ M ′ ⁢ x ′ ⁢ Ay ′ ] ) - ( - log 10 ⁢ Ksp ⁡ [ MxAy ] ) .

Claims20

Dependent claims

An apparatus for electrolytic etching and dissolution, the apparatus comprising:

an electrolytic cell comprising an anode, a cathode and an electrolytic solution comprising a chemical agent and a nonaqueous solvent;
wherein the chemical agent comprises at least one of a polyethylene amine, ethylenediamine tetraacetic acid and cyclohexanediamine tetraacetic acid, and the nonaqueous solvent comprises at least one of methanol, ethanol and isopropyl alcohol;
wherein at least a part of the cathode comprises a metal element M′, the anode comprises a metal material including a different metal element M;
wherein the metal element M′ whose A is defined by the following formula is 10 or more:
Δ
=
pKsp
⁡
[
M
′
⁢
x
′
⁢
Ay
′
]
-
pKsp
⁡
[
MxAy
]
=
(
-
log
10
⁢
Ksp
⁡
[
M
′
⁢
x
′
⁢
Ay
′
]
)
-
(
-
log
10
⁢
Ksp
⁡
[
MxAy
]
)
wherein a solubility product of metal compound M′x′Ay′ is defined as Ksp[M′x′Ay′], and a solubility product of a metal compound to be extracted from the anode is MxAy, defined as Ksp[MxAy], the solubility product Ksp is a value in an aqueous solution at 25° C.;
and
A consists of one or more of C, N, H, S, O, P, Se, Te and F for forming a compound with M or M′, and x, x′, y and y′ represent a composition ratio of the compound determined according to the valences of M, M′ and A;
and
electrolytically etching the anode to extract the metal compound MxAy by electrifying between the anode and the cathode.

57 more elements

Dependencies are inferred from the claim text.

Apparatus for electrolytic etching and dissolution and method for extracting metal compound particles

Life of this patent

Apparatus for electrolytic etching and dissolution and method for extracting metal compound particles

Life of this patent

Abstract

Claims20