Electroplating formula of nonmagnetic nickel-phosphorus alloy and continuous electroplating process thereof
Technical Field
The invention relates to the field of continuous electroplating, in particular to an electroplating formula of a nonmagnetic nickel-phosphorus alloy and a continuous electroplating process thereof.
background
The nickel-phosphorus alloy has the advantages of compact plating layer, corrosion resistance, wear resistance, excellent magnetism, optics, electricity and the like, is widely applied to products such as automobiles, communication, aviation, consumer electronics and the like, and is realized by adopting a chemical plating mode for a long time, but the chemical plating operation parameters are difficult to adjust, the quality is unstable, the yield is low, the productivity is low, chemical nickel needs to be re-bathed every five production periods (about two continuous production days), the technical difficulty of recovering phosphorus in scrapped plating liquid is high, and the trouble is brought to wastewater treatment, so the production cost is high.
Disclosure of Invention
the purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides an electroplating formula of a nonmagnetic nickel-phosphorus alloy and a continuous electroplating process thereof, wherein the mass percent of phosphorus in a nickel-phosphorus alloy coating electroplated by using the electroplating formula and the electroplating process can reach more than 11 percent to form an amorphous coating, and the compactness, the corrosion resistance and the magnetism of the amorphous coating are superior to those of chemical plating.
the technical scheme includes that the non ~ magnetic nickel ~ phosphorus alloy electroplating formula comprises 450 ~ 550ml/l of nickel sulfamate, 6 ~ 12g/l of nickel chloride, 35 ~ 45g/l of boric acid, 17g/l of phosphoric acid and 1.2g/l of 3 ~ hexyne ~ 2, 5 ~ diol, and the mass percentage of phosphorus in the nickel ~ phosphorus alloy electroplated by the formula is 11 ~ 16%.
the invention also provides a continuous electroplating process of the nonmagnetic nickel ~ phosphorus alloy, which comprises the following steps of oil removal, acid pickling and nickel ~ phosphorus plating, wherein the formula of the nonmagnetic nickel ~ phosphorus alloy is used for electroplating, the temperature is controlled to be 60 ℃, the pH value is 1.5 ~ 2, and the current density is 8 ~ 10 ASD.
further, in the oil removing step, the operation specifically comprises the following operations of ultrasonic oil removal at the bath solution temperature of 60 ℃, current density of 8 ~ 15ASD, electrolytic oil removal of alkaline oil removal powder in water solution → normal temperature water washing → hot water washing at 40 ~ 50 ℃.
further, the pickling step specifically comprises the following operations of soaking 8 ~ 20S in 20% sulfuric acid → washing with water at normal temperature → washing with hot water at 40 ~ 50 ℃.
Has the advantages that: the process can obtain amorphous nickel-phosphorus alloy coating with phosphorus mass percentage up to more than 11% by setting parameters of various components in degreasing, pickling, nickel-phosphorus plating and nickel-phosphorus plating liquid medicine and using phosphoric acid with valence state of +5 and a semigloss agent of 3-hexyne-2, 5-diol in a matching way, wherein nickel is one of paramagnetic substances, when the phosphorus content in the phosphorus-nickel alloy reaches more than 11%, the nickel-phosphorus structure has no symmetry and periodic repeatability, and an electron diffraction pattern, a neutron diffraction pattern and an X-ray diffraction pattern of the nickel-phosphorus alloy consist of wider corona and dispersive rings, so that the nickel-phosphorus alloy coating forms amorphous isotropy and has the characteristic of no magnetism. The amorphous nickel-phosphorus alloy coating is characterized in that: 1. non-magnetic; 2. the compactness and the corrosion resistance are better than those of chemical nickel; 3. excellent wear-resisting, magnetism, optics, mechanics advantage; the use of 3-hexyne-2, 5-diol in the electroplating formula ensures that the nickel-phosphorus plating layer has luster (or semi-luster) and the appearance of the plating layer is beautiful, smooth and beautiful. Compared with the traditional chemical nickel plating mode, the nickel-phosphorus alloy plating layer electroplated by the process has stable quality, high yield, low electroplating cost, less phosphorus emission and more environmental protection, all the defects of the chemical nickel-phosphorus alloy plating are solved, the phosphorus content can reach more than 11 percent to form an amorphous nickel-phosphorus alloy plating layer, and the compactness, the corrosion resistance and the magnetism of the amorphous nickel-phosphorus alloy plating layer are superior to those of the chemical plating.
drawings
FIG. 1 is a flow chart of an electroplating process of a nonmagnetic nickel-phosphorus alloy;
FIG. 2 is a photograph of a 2000-fold scanning electron microscope of a nickel-phosphorus alloy coating obtained by the electroplating formulation and process of embodiment 1;
FIG. 3 is a 30-fold scanning electron microscope photograph of a nickel-phosphorus alloy coating obtained by the electroplating formulation and process of embodiment 1;
FIG. 4 is an EDS test pattern of the nickel-phosphorus alloy plating in box 1 of FIG. 3;
FIG. 5 is an EDS test pattern of the nickel-phosphorous alloy coating in box 2 of FIG. 3.
Detailed Description
the present invention will be described in detail with reference to the accompanying drawings.
Embodiment 1:
the embodiment provides an electroplating formula of a nonmagnetic nickel-phosphorus alloy, which comprises 500ml/l of nickel sulfamate, 8g/l of nickel chloride, 40g/l of boric acid, 17g/l of phosphoric acid and 1.2g/l of 3-hexyne-2, 5-diol.
The nickel-phosphorus alloy plating layer is electroplated by using the electroplating formula through the following continuous electroplating process (the process flow is shown in figure 1):
degreasing, namely ultrasonically degreasing the bath solution at the temperature of 60 ℃, → degreasing the bath solution at the temperature of 60 ℃, performing electrolysis on the bath solution at the current density of 8 ~ 15ASD, and performing alkaline degreasing powder in water solution, namely degreasing the bath solution at the temperature of 40 ~ 50 ℃, washing the bath solution at normal temperature, and washing the bath solution with hot water at the temperature of 40 ~ 50 ℃.
acid washing, namely soaking the steel plate in 20% sulfuric acid for 8 ~ 20S → washing with water at normal temperature → washing with hot water at 40 ~ 50 ℃.
and (3) nickel ~ phosphorus plating, wherein the electroplating formula for electroplating the nonmagnetic nickel ~ phosphorus alloy is adopted, the temperature is controlled to be 60 ℃, the pH value is 1.5 ~ 2, and the current density is 8 ~ 10ASD during electroplating.
As can be seen from fig. 2, the nickel-phosphorus alloy plating layer plated using the above plating formulation and plating process has a dense crystal.
as can be seen from fig. 3 to 5, in the nickel-phosphorus alloy plating layer, the mass percentage of phosphorus reached 15.268% at the 1 st point and 15.303% at the 2 nd point.
Embodiment 2:
The embodiment provides an electroplating formula of a nonmagnetic nickel-phosphorus alloy, which comprises 550ml/l of nickel sulfamate, 6g/l of nickel chloride, 35g/l of boric acid, 17g/l of phosphoric acid and 1.2g/l of 3-hexyne-2, 5-diol.
the nickel-phosphorus alloy plating layer is plated by using the above plating formulation through the same continuous plating process as that of embodiment 1, which is not described herein.
Embodiment 3:
The embodiment provides an electroplating formula of a nonmagnetic nickel-phosphorus alloy, which comprises 450ml/l of nickel sulfamate, 12g/l of nickel chloride, 45g/l of boric acid, 17g/l of phosphoric acid and 1.2g/l of 3-hexyne-2, 5-diol.
The nickel-phosphorus alloy plating layer is plated by using the above plating formulation through the same continuous plating process as that of embodiment 1, which is not described herein.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.