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An additive, environmentally friendly technology, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve the problems of large amount of addition and reduced plating rate, and achieve low porosity, excellent compactness, and plating solution. stable effect
Pending Publication Date: 2022-04-29
GUANGDONG LEAR ELECTROCHEM LTD
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They are added in a large amount, often up to dozens of ppm, resulting in a decrease in plating speed
Method used
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Embodiment 1
[0017] This embodiment provides an environment-friendly high-phosphorus nickel plating additive, which includes component A and component B;
[0018] Wherein, the component A includes raw materials at the following concentrations: 10-15g / L sodium acetate trihydrate, 20-35g / L complexing agent, 5-10mg / L antimony potassium tartrate hemihydrate, 5-10mg / L L potassium iodide;
[0019] The component B includes raw materials at the following concentrations: 1-5 mg / L of hydroxyethyl propargyl ether (PME), 1-5 mg / L of N, N-diethyl propargyl amine (DEP), 1- 5mg / L sodium saccharin.
[0020] Use a 1L beaker as a plating tank, prepare additives A and B according to the proportion, and heat it to the working temperature for trial plating. During the electroless nickel plating process, 0.5-1.0mL / L of additives A and B were added each cycle.
[0021] In this embodiment, a galvanized iron sheet is used as a test piece, and its size is 50mm x 100mm x 0.5mm.
[0022] The process flow of elect...
Embodiment 2
[0027] Recipe and operating conditions are as follows: nickel sulfate 24g / L, sodium hypophosphite 31g / L, the raw material composition of environmental protection type high phosphorus electroless nickel plating additive is as shown in table 1:
[0028] Table 1: Raw material composition of environmentally friendly high-phosphorus electroless nickel plating additives
[0029]
[0030]
Embodiment 3
[0032] Recipe and operating conditions are as follows: nickel sulfate 25g / L, sodium hypophosphite 30g / L, the raw material composition of environment-friendly type bright high phosphorus electroless nickel plating additive is as shown in table 2:
[0033] Table 2: Raw material composition of environmentally friendly high-phosphorus electroless nickel plating additives
[0034]
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Abstract
The invention provides an environment-friendly high-phosphorus nickel plating additive. The additive comprises a component A and a component B, the component A is prepared from the following raw materials in concentration: 10 to 15g/L of sodium acetate trihydrate, 20 to 35g/L of complexing agent, 5 to 10mg/L of antimony potassium tartrate semihydrate and 5 to 10mg/L of potassium iodide; the component B is prepared from the following raw materials in concentration: 1 to 5 mg/L of hydroxyethyl propargyl ether (PME), 1 to 5 mg/L of N, N-diethyl propargyl amine (DEP) and 1 to 5 mg/L of saccharin sodium salt. The additive formula does not contain toxic heavy metal ions such as lead and cadmium, a plating layer is bright, has specular gloss, is low in porosity, excellent in compactness and good in nitric acid resistance, and does not change color after being soaked in concentrated nitric acid for 5 minutes; after the nickel plating additive is used, a plating layer is high in bright emitting speed, has a bright effect after 3 minutes, and has specular luster after 10 minutes. The plating solution is stable, and the service life is long and can reach at least eight periods.
Description
technical field [0001] The invention relates to the technical field of nickel-gold plating on PCB surface, in particular to an environment-friendly high phosphorus nickel plating additive. Background technique [0002] Electroless Nickel (EN) technology has been widely used in machinery, electronics, petrochemical, mining, medical It is widely used in many fields such as equipment, automobile, aviation and other industries. Nickel-phosphorus alloys mainly include low phosphorus (1%-4%), medium phosphorus (5%-8%) and high phosphorus (9%-12%). High phosphorus electroless nickel plating has an amorphous structure, not only has excellent corrosion resistance, but also has stable non-magnetic properties, high resistivity and low temperature coefficient, and is an excellent functional coating. In the process of nickel-gold surface treatment of circuit boards, a nickel protective layer is first deposited on the copper surface by oxidation-reduction method, and then a replacement ...
Claims
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Application Information
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