Electric deposition preparation method of Ni-Co-B alloy substituted hard chromium plating

A 1. ni-co-b, electrodeposition technology, applied in the field of preparation of Ni-Co-B alloy instead of hard chromium coating, can solve the problems of trivalent chromium coating such as poor gloss, unreachable hardness, low concentration, etc. Achieve the effect of good appearance, high hardness, good corrosion resistance and bonding force

Inactive Publication Date: 2012-02-15
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The toxicity of trivalent chromium is only 1% of that of hexavalent chromium, and the concentration of chromium in trivalent chromium plating solution is low, which is about 1 / 10 of the chromium concentration in hexavalent chromium plating solution. It has high current efficiency and good dispersion ability. However, the gloss of the trivalent chromium coating is poor, the thickness is thin, the hardness is not up to the standard of the hexavalent chromium coating, and it is particularly sensitive to impurities, so it can only be used as an electroplating for decorative coatings.
Therefore, there is still no process method that can completely replace hard chrome plating in actual production.

Method used

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  • Electric deposition preparation method of Ni-Co-B alloy substituted hard chromium plating
  • Electric deposition preparation method of Ni-Co-B alloy substituted hard chromium plating
  • Electric deposition preparation method of Ni-Co-B alloy substituted hard chromium plating

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specific Embodiment approach 1

[0014] Specific embodiment one: the electrodeposition preparation method of the Ni-Co-B alloy substitution hard chromium coating of this embodiment is carried out according to the following steps: 1. Weigh 60-240g of nickel salt, 6-24g of cobalt salt, 15-40g of Nickel chloride, 20-50g boric acid, 1-10g amine boron compound, 1-10ml NI3 # Quick and high-level nickel plating gloss agent A and 0.01-0.1g of sodium lauryl sulfate; 2. Dissolve the weighed boric acid in 200-600ml of water at 50-70°C, and then add nickel in turn Salt, cobalt salt, nickel chloride and amine boron compound and stir until dissolved, then add sodium lauryl sulfate and N13 # Fast and high-level nickel plating gloss agent A, then use NaOH solution or dilute H 2 SO 4 solution to adjust the pH value of the solution to 2.0-5.5, add water to make the volume to 1L, and obtain the Ni-Co-B alloy plating solution; 3. The plated parts are washed with water after conventional alkaline degreasing or electrochemical d...

Embodiment 1

[0018] The electrodeposition preparation method of Ni-Co-B alloy substitutes hard chrome coating is carried out as follows: one, take by weighing the nickel salt of 60g, the cobalt salt of 9g, the nickel chloride of 15g, the boric acid of 40g, the amine boron compound of 6g, 3ml of NI3 # Quick and high-level nickel plating gloss agent A and 0.01g of sodium lauryl sulfate; 2. Dissolve the weighed boric acid in 500ml of water at 50°C, and then add nickel salt, cobalt salt, and chlorine in sequence Nickel and amine boron compound were stirred until dissolved, then sodium lauryl sulfate and N13 were added # Fast and high-level nickel plating gloss agent A, then use NaOH solution or dilute H 2 SO 4 The solution adjusts the pH value of the solution to 4.0, and then adds water to make the volume to 1L to obtain the Ni-Co-B alloy plating solution; three, the plated parts are washed with water after conventional alkaline degreasing or electrochemical degreasing, and then placed in a ...

Embodiment 2

[0022] The electrodeposition preparation method of Ni-Co-B alloy substitutes hard chrome coating is carried out as follows: one, take by weighing the nickel salt of 240g, the cobalt salt of 18g, the nickel chloride of 35g, the boric acid of 30g, the amine boron compound of 9g, 7ml of NI3 # Quick and high-level nickel plating gloss agent A and 0.05g of sodium lauryl sulfate; 2. Dissolve the weighed boric acid in 400ml of water at 50°C, and then add nickel salt, cobalt salt, and chlorine in sequence Nickel and amine boron compound were stirred until dissolved, then sodium lauryl sulfate and N13 were added # Fast and high-level nickel plating gloss agent A, then use NaOH solution or dilute H 2 SO 4 The solution adjusts the pH value of the solution to 3.0, and then adds water to make the volume to 1L to obtain the Ni-Co-B alloy plating solution; 3. The plated parts are washed with water after conventional alkaline degreasing or electrochemical degreasing, and then placed in a vo...

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Abstract

The invention provides an electric deposition preparation method of a Ni-Co-B alloy substituted hard chromium plating, relating to a preparation method of the Ni-Co-B alloy substituted hard chromium plating. The method 1 comprises the following steps of: taking nickel salt, cobalt salt, nickel chloride, boric acid, amine boride, NI3<#> fast high-level nickel-plating glazing agent A and lauryl sodium sulfate; preparing an alloy plating solution; and plating a processed plated part. The method 2 comprises the following steps of: taking nickel chloride, cobalt salt, boric acid, amine boride, NI3<#> fast high-level nickel-plating glazing agent A and lauryl sodium sulfate; preparing an alloy plating solution; and plating a processed plated part. In the invention, a Ni-Co-B alloy plating with uniform brightness, hardness of 770-800HV50 as well as good corrosion resistance and bonding force is obtained at a deposition rate higher than 60mu m/h. In the plating process, the cathode current efficiency is higher than 96%; and after the plating is subjected to heat treatment at 150-400 DEG C for 1-3 hours, the hardness of the plating can be increased to 1055-1108HV50.

Description

technical field [0001] The invention relates to a preparation method of a Ni-Co-B alloy substituting hard chromium coating. Background technique [0002] Chromium electroplating is one of the most widely used plating types in the electroplating industry. The coating obtained from the plating solution containing hexavalent chromium has many advantages such as good brightness, high hardness, strong resistance to discoloration, and good wear and corrosion resistance. Therefore, it has been widely used in the fields of functional coating and decorative coating. For a century, chromium plating has mainly used a plating solution composed of chromic acid and sulfuric acid, which is stable and easy to operate. However, there are many obvious shortcomings in this process, such as very low current efficiency, only 8% to 16%; its dispersion and coverage are very low, often need to use pictographic anode and auxiliary cathode; Acidic, strong oxidizing, strong corrosive, highly toxic, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
Inventor 杨培霞安茂忠崔莹刘磊曾鑫郭伟荣项昕
Owner HARBIN INST OF TECH
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