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Reagent for detecting chemical nickel plating thickness on iron-aluminum by using Coulometric, preparation method and application

An electroless nickel plating and reagent technology, applied in the field of chemical detection, can solve problems such as the inability of electroless nickel plating to obtain accurate detection results, and achieve the effects of low cost, simple operation method and improved practicability.

Inactive Publication Date: 2019-01-11
三思永恒科技(浙江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned situation, the object of the present invention is to provide a reagent for coulometric detection of the thickness of electroless nickel plating on iron and aluminum, to solve the problem that the prior art cannot obtain accurate detection results for electroless nickel plating with high phosphorus content

Method used

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  • Reagent for detecting chemical nickel plating thickness on iron-aluminum by using Coulometric, preparation method and application
  • Reagent for detecting chemical nickel plating thickness on iron-aluminum by using Coulometric, preparation method and application

Examples

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preparation example Construction

[0029] The preparation method of this reagent is:

[0030] Under normal temperature, 25-35g of chromic anhydride and 2-4g of boric acid are dissolved in 100mL of water, mixed and fully dissolved to prepare a reagent for detecting the thickness of electroless nickel plating on iron and aluminum by coulometric method.

[0031] Using a Coulomb method electrolytic thickness gauge, the reagent for detecting the thickness of electroless nickel plating on iron-aluminum by the above-mentioned Coulomb method is used for the thickness of electroless nickel plating on high-phosphorus iron-aluminum, wherein the constant current of the Coulomb method electrolytic thickness gauge is: 7A / dm 2 , the preset voltage is 0.5V.

Embodiment 1

[0034] A reagent for coulometrically detecting the thickness of electroless nickel plating on iron and aluminum, containing 25 g of chromic anhydride and 3 g of boric acid in every 100 mL of the reagent.

[0035] Under normal temperature, 25g of chromic anhydride and 3g of boric acid were dissolved in 100mL of water, fully dissolved and mixed; a reagent for detecting the thickness of electroless nickel plating on iron and aluminum by coulometric method was prepared.

[0036] The reagents described in this example are used in the same way as the existing reagents.

[0037] Test the American KOCOUR chemical nickel standard sheet with a phosphorus content of 12%, the thickness is 5.3μm, the uniformity is ±5%, and the thickness gauge gives a constant current of 7A / dm 2 , the preset voltage is 0.5V electrolytic coating, and the continuous test is 5 times, the potential diagram is as follows figure 1 shown, from figure 1 It can be seen that the chemical nickel layer has been teste...

Embodiment 2

[0042] A reagent for coulometrically detecting the thickness of electroless nickel plating on iron and aluminum, containing 35 g of chromic anhydride and 3 g of boric acid in every 100 mL of the reagent.

[0043] Under normal temperature, 35 g of chromic anhydride and 3 g of boric acid were dissolved in 100 mL of water, fully dissolved and mixed; a reagent for detecting the thickness of electroless nickel plating on iron and aluminum by coulometric method was prepared.

[0044] The reagents described in this example are used in the same way as the existing reagents.

[0045] Test the American KOCOUR chemical nickel standard sheet with a phosphorus content of 12%, the thickness is 5.3μm, the uniformity is ±5%, and the thickness gauge gives a constant current of 7A / dm 2 , Preset voltage 0.5V electrolytic coating, continuous test 5 times, the average result of final thickness detection is: 5.308μm.

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Abstract

The invention discloses a reagent for detecting a chemical nickel plating thickness on iron-aluminum by using the Coulometric. A phosphorus content in the iron-aluminum is 6% to 12%, and the reagent comprises the following components: chromic anhydride and boric acid. The preparation method of the reagent is as follows: dissolving 25 to 35 g of chromic anhydride and 2 to 4 g of boric acid in 100 mL of water at room temperature for mixing, and the reagent for detecting the chemical nickel plating thickness on the iron-aluminum by using the Coulometric is prepared after the components are fullydissolved. By adoption of the reagent, the chemical nickel plating thickness on high-phosphorus iron-aluminum is detected by using a Coulometric electrolytic thickness gauge, an obvious potential change can be collected, a reliable thickness result is obtained after stop, the stability of the reagent is high, and the chemical nickel plating thickness on the high-phosphorus iron-aluminum can be detected accurately.

Description

technical field [0001] The invention relates to the technical field of chemical detection, in particular to a reagent, preparation method and application for detecting the thickness of electroless nickel plating on iron and aluminum by coulometric method. Background technique [0002] As a new environmentally friendly surface treatment technology, electroless nickel plating has many advantages: the uniformity of plating is very good, especially suitable for high-precision workpieces, and it can reach high hardness after heat treatment after plating. In the prior art, there are three commonly used methods for detecting the thickness of the nickel plating layer as follows: a. Metallographic detection; b. Radiographic detection; c. Coulomb method, that is, electrolytic thickness measurement. [0003] Among them, a, metallographic microscopy, its advantage is high precision, the disadvantage is that cutting, polishing, microscopic measurement, and pretreatment take a lot of time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/06
CPCG01B7/06
Inventor 陈发松
Owner 三思永恒科技(浙江)有限公司