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Electroplating process of high-abrasion resistance corrosion-resistance Pd-Co gradient alloy for stainless steel surface

A gradient alloy and electroplating technology, which is applied in the field of alloy electroplating to achieve stable performance, no pinholes, and high hardness

Active Publication Date: 2015-05-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is worth noting that there is no report on Pd–Co gradient alloy plating in the literature and patents.

Method used

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  • Electroplating process of high-abrasion resistance corrosion-resistance Pd-Co gradient alloy for stainless steel surface
  • Electroplating process of high-abrasion resistance corrosion-resistance Pd-Co gradient alloy for stainless steel surface
  • Electroplating process of high-abrasion resistance corrosion-resistance Pd-Co gradient alloy for stainless steel surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, industrial 316L (GB00Cr17Ni14Mo2) stainless steel plate electroplating Pd--Co gradient alloy:

[0029] (1) Pre-treatment: including grinding off the burrs on the rough surface, chemical degreasing, electrochemical activation, and deionized water rinsing.

[0030] (2) Immediately followed by electroplating Pd–Co gradient alloy, the composition of the plating solution is:

[0031] Palladium salt Pd(NH 3 ) 4 Cl 2 : The measurement is 5g / L based on the mass of Pd

[0032] NH 4 Cl: 50g / L

[0033] The mass percent concentration is 28% NH 3 ·H 2 O: 50ml / L

[0034] CoCl 2 ·6H 2 O: 16g / L

[0035] C 2 h 5 o 2 N: 50g / L

[0036] Saccharin: 1g / L

[0037] The electroplating method is: adjust the pH value of the plating solution to 8, and then use 0.6, 0.8, 1.0, 1.2A / dm 2 Electroplating at the current density for 2min.

[0038] After the plating is completed, a coating with good bonding force, uniformity and excellent erosion and corrosion resistance is...

Embodiment 2

[0043] Embodiment 2, industrial 316L (GB00Cr17Ni14Mo2) stainless steel plate electroplating Pd--Co gradient alloy:

[0044] (1) Pre-treatment: including grinding off the burrs on the rough surface, chemical degreasing, electrochemical activation, and deionized water rinsing.

[0045](2) Immediately followed by electroplating Pd–Co gradient alloy, the composition of the plating solution is:

[0046] Palladium salt Pd(NH 3 ) 4 Cl 2 : Measured by the mass of Pd 10g / L

[0047] NH 4 Cl: 70g / L

[0048] The mass percent concentration is 28% NH 3 ·H 2 O: 80ml / L

[0049] CoCl 2 ·6H 2 O: 16g / L

[0050] C 2 h 5 o 2 N: 50g / L

[0051] Saccharin: 1g / L

[0052] The electroplating method is: adjust the pH value of the plating solution to 8, and then use 0.6, 0.8, 1.0, 1.2A / dm 2 Electroplating at the current density for 2min.

[0053] After the plating is completed, a coating with good bonding force, uniformity and excellent erosion and corrosion resistance is obtained. Vari...

Embodiment 3

[0058] Embodiment 3, industrial 316L (GB00Cr17Ni14Mo2) stainless steel plate electroplating Pd--Co gradient alloy:

[0059] (1) Pre-treatment: including grinding off the burrs on the rough surface, chemical degreasing, electrochemical activation, and deionized water rinsing.

[0060] (2) Immediately followed by electroplating Pd–Co gradient alloy, the composition of the plating solution is:

[0061] Palladium salt Pd(NH 3 ) 4 Cl 2 : The measurement is 5g / L based on the mass of Pd

[0062] NH 4 Cl: 50g / L

[0063] The mass percent concentration is 28% NH 3 ·H 2 O: 50ml / L

[0064] CoCl 2 ·6H 2 O: 16g / L

[0065] C 2 h 5 o 2 N: 50g / L

[0066] Saccharin: 1g / L

[0067] The electroplating method is: adjust the pH value of the plating solution to 8, and then use 0.5, 0.8, 1.1, 1.4A / dm 2 Electroplating at the current density for 3min.

[0068] After the plating is completed, a coating with good bonding force, uniformity and excellent erosion and corrosion resistance is...

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Abstract

The invention relates to an electroplating process of a high-abrasion resistance corrosion-resistance Pd-Co gradient alloy for a stainless steel surface. The electroplating process comprises a surface pre-treating step and an electroplating step, and is characterized in that an electroplating solution used in the electroplating step is composed of 5-12 g / L of palladium salt Pd (NH3)4Cl2 (measured by the mass of Pd), 50-125 g / L of NH4Cl, 50-100 ml / L of NH3.H2O with the mass percent concentration of 28%, 16-50 g / L of CoCl2.6H2O, 50-100 g / L of C2H5O2N, 1-5 g / L of saccharin and the balance of water, wherein the pH value is 7-8, and the temperature is 30-50 DEG C. In the electroplating step, electroplating is sequentially carried out for 2-3 min by adopting the current density of (0.5-0.6), (0.8-0.9), (1.0-1.1) and (1.2-1.4) A / dm<2>. The electroplating process is simple, and realizes the preparation of a gradient coating in a single trough; the obtained coating is excellent in washing resistance, excellent in corrosion resistance and capable of exerting the good protection effect on stainless steel in a solid-liquid two-phase scoured high-temperature non-oxidizing medium.

Description

technical field [0001] The invention belongs to the field of alloy electroplating, uses the process to process stainless steel materials, and belongs to a stainless steel anticorrosion treatment process under flushing conditions and working in a high-temperature non-oxidizing medium (especially an acidic medium) environment. Background technique [0002] Stainless steel has good corrosion resistance because a dense passivation film can be formed on the surface. However, in many chemical plants in my country, some stainless steel equipment is used in the harsh environment of high-temperature non-oxidizing media (especially acidic media), and a dense passivation film cannot be formed on the surface of the stainless steel, resulting in serious corrosion of the equipment. At the same time, the actual production environment is often accompanied by the erosion and corrosion of solid-liquid two-phase, resulting in more serious material loss. There are few protection methods availa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D5/18
CPCC25D3/56C25D5/18
Inventor 左禹李思锐赵旭辉唐聿明
Owner BEIJING UNIV OF CHEM TECH
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