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Method for determining porosity of gold plating layer by utilizing sulfite solution

A sulfurous acid, porosity technology, applied in suspension and porous material analysis, measurement device, permeability/surface area analysis, etc. Rapid detection, simple test method, real and reliable data

Inactive Publication Date: 2013-02-06
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still some problems in the process and material processing of gold coatings at home and abroad, so that there are many micropores on the surface of gold coatings. The traditional porosity detection of gold coatings usually uses strong acid media such as sulfuric acid or nitric acid vapor corrosion experiments and optical microscopes. The characteristic of this method is that the surface of the corroded gold coating is covered with a large number of corrosion products, which makes it difficult to test the porosity and easily leads to misjudgment

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  • Method for determining porosity of gold plating layer by utilizing sulfite solution
  • Method for determining porosity of gold plating layer by utilizing sulfite solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method utilizing sulfurous acid solution to measure the porosity of the gold coating comprises the following steps:

[0019] In the first step, the samples with gold plating are cleaned.

[0020] In order to compare the consistency and uniformity of the corrosion method, the sample size of the gold plating material is 25mm×10mm; the sample is cleaned ultrasonically with absolute alcohol;

[0021] The second step, sample corrosion: take 8 grams of KMnO 4 Put 20ml of sulfurous acid solution into a 50ml beaker and mix and stir. The sulfurous acid solution is analytically pure, and its concentration is 6% SO in 500ml of water. 2 ;Put the beaker into the drying oven, adjust the temperature of the drying oven so that the temperature in the drying oven reaches 45°C, put the sample into the solution in the beaker, and keep it warm for 30 minutes.

[0022] Using KMnO 4 The advantage of the solution is that it can distinguish pores without producing a large amount of corrosi...

Embodiment 2

[0033] A method utilizing sulfurous acid solution to measure the porosity of the gold coating comprises the following steps:

[0034] In the first step, the samples with gold plating are cleaned.

[0035] In order to compare the consistency and uniformity of the corrosion method, the sample size of the gold plating material is 25mm×10mm; the sample is cleaned ultrasonically with absolute alcohol;

[0036] The second step, sample corrosion: take 8 grams of KMnO 4 Put 30ml of sulfurous acid solution into a 50ml beaker and mix and stir. The sulfurous acid solution is analytically pure, and its concentration is 6% SO in 500ml of water. 2 ;Put the beaker into the drying oven, adjust the temperature of the drying oven so that the temperature in the drying oven reaches 55°C, put the sample into the solution in the beaker, and keep it warm for 10 minutes.

[0037] Using KMnO 4 The advantage of the solution is that it can distinguish pores without producing a large amount of corrosi...

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Abstract

The invention relates to a method for determining a porosity of a gold plating layer by utilizing a sulfite solution. The porosity of a gold-plated contact surface is an important index for representing the quality of a plating layer, evaluates the protection effectiveness of the plating layer to a substrate and is taken as a primary index for evaluating the quality of the plating layer. At present, the surfaces of the domestic and oversea noble metal plating layers have more micro-pores; a corrosion test adopting a strong acid medium, such as, sulfuric acid or nitric acid vapor, and the like, is traditionally adopted for detecting the porosity of the noble metal plating layers; the method is characterized in that a large quantity of corrosion reagents is required and the corrosion time is long; a large quantity of corrosion resultants are covered on the surfaces of the corroded noble metal plating layers; a difficulty in testing the porosity is caused; and the error judgment is easily caused. In order to overcome the defects of the present method for detecting the porosity of the noble metal plating layers, the invention provides a detecting method. According to the method provided by the invention, the consumed KMnO4 and SO2 solution is less, the damage to the environment is small, the detecting method is simple, quick and convenient, and the porosity of the noble metal plating layers can be accurately detected according to the method.

Description

technical field [0001] The invention relates to a method for measuring the porosity of a gold coating by using a sulfurous acid solution, and belongs to the technical field of engineering materials. Background technique [0002] The microporosity of the surface of the gold-plated contact is an important indicator of the quality of the coating, which indicates the degree of protection of the coating on the substrate. The total area of ​​micropores on the surface of the coating is the concentrated expression of the number and area of ​​micropores, and should be used as the most important indicator for evaluating the quality of coatings. At present, there are still some problems in the process and material processing of gold coatings at home and abroad, so that there are many micropores on the surface of gold coatings. The traditional porosity detection of gold coatings usually uses strong acid media such as sulfuric acid or nitric acid vapor corrosion experiments and optical m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 孔志刚许良军芦娜周怡琳林雪燕
Owner BEIJING UNIV OF POSTS & TELECOMM
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