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Process method for electroplating casting with acidic zinc-nickel alloy

A zinc-nickel alloy and process method technology, applied in jewelry and other directions, can solve the problems of rough coating, poor electroplating effect, poor deep plating ability and throwing ability, etc., to prevent corrosion, avoid easy scorching of the surface, and enhance bonding effect of ability

Pending Publication Date: 2022-05-13
鹰普航空科技(南通)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating is rough, the deep plating ability and throwing ability are poor, and the electroplating effect on parts with complex structures is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A process for electroplating acidic zinc-nickel alloys for castings, comprising the following steps:

[0028] Step 1: Chemical degreasing: chemically degreasing the surface of the parts to be plated, using U-279 degreasing powder with a concentration of 70g / L for chemical degreasing, the degreasing temperature is 55°C, the degreasing time is 15min, and then put Wash in the cleaning tank for 5s;

[0029] Step 2: One-time anode electrolytic degreasing: send the plated parts after chemical degreasing into the anode electrolytic degreasing tank for one anodic electrolytic degreasing, perform electrolysis at 55°C and 1.5A / dm2 for 5 minutes, and then put them into cleaning Wash in the tank for 5s;

[0030] Step 3: One-time ultrasonic degreasing: put the workpiece after electrolytic degreasing into the ultrasonic degreasing tank, use U-279 degreasing powder with a concentration of 70g / L for ultrasonic degreasing, and the degreasing time is 5 minutes;

[0031] Step 4: Picklin...

Embodiment 2

[0041] A process for electroplating acidic zinc-nickel alloys for castings, comprising the following steps:

[0042] Step 1: Chemical degreasing: Chemically degreasing the surface of the parts to be plated, using U-279 degreasing powder with a concentration of 100g / L for chemical degreasing, the degreasing temperature is 65°C, the degreasing time is 21min, and then Wash in the cleaning tank for 10s;

[0043] Step 2: Primary anode electrolytic degreasing: Send the plated parts after chemical degreasing into the anode electrolytic degreasing tank for an anode electrolytic degreasing, perform electrolysis at 65°C and 4A / dm2 for 7 minutes, and then put them into the cleaning tank Wash in water for 10s;

[0044] Step 3: One-time ultrasonic degreasing: put the workpiece after electrolytic degreasing into the ultrasonic degreasing tank, use U-279 degreasing powder with a concentration of 100g / L for ultrasonic degreasing, and the degreasing time is 7 minutes;

[0045] Step 4: Pickli...

Embodiment 3

[0055] A process for electroplating acidic zinc-nickel alloys for castings, comprising the following steps:

[0056] Step 1: Chemical degreasing: Chemically degreasing the surface of the parts to be plated. Chemical degreasing uses U-279 degreasing powder with a concentration of 85g / L. The degreasing temperature is 60°C, and the degreasing time is 181min. Wash in the cleaning tank for 7s;

[0057] Step 2: Primary anode electrolytic degreasing: Send the plated parts after chemical degreasing into the anode electrolytic degreasing tank for an anode electrolytic degreasing, perform electrolysis at 60°C and 1.5-4A / dm2 for 6 minutes, and then put Wash in the cleaning tank for 7s;

[0058] Step 3: One-time ultrasonic degreasing: put the workpiece after electrolytic degreasing into the ultrasonic degreasing tank, use U-279 degreasing powder with a concentration of 85g / L for ultrasonic degreasing, and the degreasing time is 6 minutes;

[0059] Step 4: Pickling: Put the plated parts ...

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Abstract

The invention discloses a technological method for electroplating a casting with an acidic zinc-nickel alloy. The technological method comprises the following steps of chemical oil removal, primary anode electrolysis oil removal, primary ultrasonic oil removal, acid pickling, secondary anode electrolysis, secondary ultrasonic oil removal, acid activation, electroplating, passivation and sealing. An electrolytic degreasing process is added after normal pickling, so that the degreasing effect is enhanced; ultrasonic oil removal is added in the pretreatment process, and it is effectively guaranteed that tiny holes of the part are clean; the pickling corrosion inhibitor is added on the premise of controlling the concentration and the pickling time of the pickling liquid medicine, so that the pickling liquid medicine can be prevented from corroding a part matrix, and meanwhile, an oxide film on the surface of the part is effectively removed; the current density range is controlled, the problems that metal electrodeposition on the iron casting is difficult, and a plating layer is rough are solved, and the deep plating capacity and the uniform plating capacity of the part are improved; the post-treatment process of passivation and sealing is adopted, the overall corrosion resistance of the plating layer is improved, and meanwhile the bonding capacity between the water-based silicon-containing reaction type sealing agent and the plating layer is enhanced by adopting the water-based silicon-containing reaction type sealing agent.

Description

technical field [0001] The invention relates to the field of iron casting electroplating, in particular to a process method for electroplating acidic zinc-nickel alloy on castings. Background technique [0002] Iron castings have excellent performance and are widely used in parts with complex stress and high requirements for strength, toughness and wear resistance. However, because the cast iron material contains carbon and silicon elements, it is difficult to deposit metal during the electroplating process, and the high current density area is easy to burn. And because the surface is rough, the oxide film is thicker, and the removal is not thorough, it is easy to cause the coating to be rough after electroplating and the bonding force is not good. Acidic electroplating liquid has excellent deposition speed and current efficiency, and is more suitable for electroplating on cast iron parts than alkaline electroplating liquid. However, the coating is relatively rough, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/48C25D3/56C25D5/36C25D7/00
CPCC25D5/48C25D3/565C25D5/36C25D7/003
Inventor 史薛康徐雪生
Owner 鹰普航空科技(南通)有限公司
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