Summary of the invention
The object of the present invention is to provide that a kind of processing method is simple, easy to operate, technical process is short, be the sulphur source to contain the S compound, by the method for nickel element sulphur direct chemical prepared in reaction sulfur-bearing nickel material in electroplating solution.
The preparation method of a kind of sulfur-bearing nickel material of the present invention is to adopt following proposal to realize:
A kind of preparation method of sulfur-bearing nickel material is in containing the plating system of nickel plating solution, and sulfocompound solution is splashed in the electroplate liquid near the negative plate; On negative plate, the galvanic deposit of NiS electroless plating and nickel is carried out simultaneously, prepares the sulfur-bearing nickel material.
Among the preparation method of a kind of sulfur-bearing nickel material of the present invention, the anode of described plating system adopts metallic nickel or graphite material; Described negative electrode adopts metal titanium or stainless material; Described cathode current density is controlled at 5~10A/dm
2Describedly contain that nickel concentration is 30~100g/L in the nickel plating solution.
Among the preparation method of a kind of sulfur-bearing nickel material of the present invention, the described nickel plating solution that contains is selected from least a in single nickel salt, nickelous chloride, nickel sulfamic acid, the nickel fluoborate solution.
Among the preparation method of a kind of sulfur-bearing nickel material of the present invention, described sulfocompound is selected from least a in hydrogen sulfide, sodium sulphite, potassium sulphide, the ammonium sulfide.
Among the preparation method of a kind of sulfur-bearing nickel material of the present invention, the concentration of described sulfocompound solution is controlled at 0.001~0.01mol/L, and near its rate of addition negative plate is controlled at 0.04~0.2L/dm
2H; The massfraction of the sulphur of the sulfur-bearing nickel material of preparation is 0.02%~0.2%.
The present invention is owing to adopt above-mentioned processing method, and sulfocompound is fed in the electroplate liquid near the negative plate, and under electric field action, the nickel ion in sulfocompound and the electroplate liquid is pressed the direct single step reaction of following formula:
S
2-+Ni
2+→NiS↓
Reaction product NiS is deposited on the negative electrode; Simultaneously, nickel constantly galvanic deposit on negative electrode under electric field action in electroplating process, i.e. the galvanic deposit of the electroless plating of NiS and nickel is carried out simultaneously, thereby prepares the sulfur-bearing nickel material.
By nickel concentration and current density in the control plating bath, with negative electrode and anode water placing flat, the plating of negative electrode is faced up, can on the plating face of negative electrode, obtain the sulfur-bearing nickel material.
The process of the galvanic deposit by the control electroless plating of NiS and nickel is promptly controlled current density, the bath concentration of electroplating process, the addition and the interpolation speed of sulfocompound, can realize effective control of the sulphur content in the sulfur-bearing nickel material.Wherein: current density, bath concentration are according to the nickel content M in the sulfur-bearing nickel material of design
NiCalculate; Because, M
Ni=KQ, K is the electrochemical equivalent of electric deposition nickel, is a constant, promptly 1.095, Q is the ampere-hour number of electroplating process; Therefore, as nickel content M
NiAfter determining, the ampere-hour number of electroplating process can determine, thereby, can determine corresponding current density and electroplating time.After the volume of plating tank is determined, promptly can be according to the nickel content M in the sulfur-bearing nickel material of design
Ni, calculate the initial concentration of electroplate liquid, require the initial concentration of electroplate liquid to separate out M in galvanic deposit
NiAfter, still can keep the works better of the system of electroplating.Conversion obtains the addition of sulfocompound according to the sulphur content in the sulfur-bearing nickel material of design equally; After the addition and electroplating time of determining sulfocompound, then can determine the concentration of sulfocompound solution according to the interpolation speed of being convenient to control.Thereby realize controlling more accurately within the specific limits the sulphur content in the prepared sulfur-bearing nickel material.
In sum; technology of the present invention is simple, easy to operate; by selecting the new S compound sulphur source that contains, adopt the codeposition mode of the galvanic deposit of the electroless plating of sulphur and nickel to prepare the sulfur-bearing nickel material, help controlling the sulphur content of sulfur-bearing nickel material; the difficulty preparation and the unmanageable problem of sulphur content of current sulfur-bearing nickel material have been solved; the sulfur-bearing nickel material of preparing, its sulphur content can be controlled in 0.02%~0.2% scope, constant product quality; technical process is short, can accomplish scale production.
Embodiment
Embodiment 1
Adopt the galvanized mode of solution, adopt the metal nickel plate plate at anode, electroplate liquid adopts single nickel salt and nickel fluoborate to press 1: 2 blended solution of mass ratio, nickel concentration is controlled at 90~100g/L, negative electrode adopts stainless steel plate, the equal horizontal positioned of negative electrode and anode, the plating of negative electrode faces up, and current density is controlled at 9~10A/dm
2Sodium sulphite is selected in the sulphur source, and sodium sulfide solution feeds near the negative electrode with pipeline, and the concentration of sodium sulfide solution is controlled at 0.001~0.002mol/L, and near its rate of addition negative plate is controlled at 0.04~0.06L/dm
2H after the deposition of 100Ah, obtains gross weight and is about 105 grams, and sulphur content is 0.02%~0.04% sulfur-bearing nickel material.
Embodiment 2
Adopt the galvanized mode of solution, anode adopts metal nickel plate, and electroplate liquid adopts nickel sulfamic acid solution, nickel concentration is controlled at 50~60g/L, and negative electrode adopts metallic titanium plate, the equal horizontal positioned of negative electrode and anode, the plating of negative electrode faces up, and current density is controlled at 5~8A/dm
2Sodium sulphite and potassium sulphide are selected in the sulphur source, sodium sulphite and potassium sulphide are pressed 1: 1 blended aqueous solution of mass ratio with near the pipeline feeding negative electrode, the total concn of element sulphur is controlled at 0.004~0.006mol/L in the solution, and near its rate of addition negative plate is controlled at 0.05~0.15L/dm
2H after the deposition of 500Ah, obtains gross weight and is about 540 grams, and sulphur content is 0.08%~0.12% sulfur-bearing nickel material.
Embodiment 3
Adopt the galvanized mode of solution, anode adopts graphite cake, and electroplate liquid adopts nickel chloride solution, nickel concentration is controlled at 30~40g/L, and negative electrode adopts metallic titanium plate, the equal horizontal positioned of negative electrode and anode, the plating of negative electrode faces up, and current density is controlled at 7~10A/dm
2Ammonium sulfide is selected in the sulphur source, and the aqueous solution of ammonium sulfide is fed near the negative electrode with pipeline, and the total concn of element sulphur is controlled at 0.009~0.01mol/L in the solution, and near its rate of addition negative plate is controlled at 0.06~0.1L/dm
2H after the deposition of 800Ah, obtains gross weight and is about 870 grams, and sulphur content is 0.18%~0.2% sulfur-bearing nickel material.