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Method for quantitatively determining content of cuprous oxide in corrosion products of copper

A technology for corrosion products and cuprous oxide, which is applied in the direction of chemical analysis by titration, and can solve the problems of inability to accurately measure the content of cuprous oxide.

Inactive Publication Date: 2017-11-03
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

The constant current cathodic reduction method cannot accurately determine the content of cuprous oxide under the condition of non-uniform corrosion; the weight loss and weight gain ratio method and infrared absorption spectroscopy can only semi-quantitatively explain the content of cuprous oxide

Method used

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  • Method for quantitatively determining content of cuprous oxide in corrosion products of copper
  • Method for quantitatively determining content of cuprous oxide in corrosion products of copper
  • Method for quantitatively determining content of cuprous oxide in corrosion products of copper

Examples

Experimental program
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Embodiment 1

[0025] Quickly prepare a rusted copper sheet sample with only cuprous oxide on the surface: polish a pure copper sheet with a size of 25mm×10mm×1mm to 3000 mesh with SiC polishing paper, and then polish it to 1 μm with a diamond abrasive. Put the polished pure copper sheet into the boiling saturated copper sulfate solution and let it stand for 1 hour, then rinse it with deionized water, take out the corroded copper sample from the copper sulfate solution, and ultrasonically vibrate the front and back of the corroded copper sheet 20s removes the copper sulfate reagent sticking to the surface, then repeatedly rinses with deionized water, and dries to make a uniform and dense cuprous oxide film on the surface of the copper sheet (see figure 2 , image 3 ). Weigh the mass of the rusted copper sheet to be 3.961267g

[0026] according to figure 1 Process shown:

[0027] 1) Dissolution of corrosion products on the surface of the rusted copper sheet: use high-purity nitrogen (99....

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Abstract

The invention specifically relates to a method for quantitatively determining the content of cuprous oxide in the corrosion products of copper, belonging to the technical field of inorganic chemical analysis. The method comprises the following steps: dissolving cuprous oxide on a to-be-detected sample in ammonia water under an anoxic condition, adding a ferric sulfate solution acidified by sulfuric acid after dissolving, and allowing ferric sulfate to oxidize cuprous ions into copper ion and to be reduced into ferrous sulfate; and titrating ferrous sulfate by using a standard potassium permanganate solution in an aerobic environment and calculating the content of cuprous oxide according to the content of ferrous sulfate. The method provided by the invention can quantitatively determine the content of cuprous oxide and has measurement error of + / - 3% or below. The method is applicable to research on the corrosion mechanism of copper.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical analysis, in particular, the invention relates to a method for quantitatively measuring the content of cuprous oxide in copper corrosion products. Background technique [0002] In the natural environment, the corrosion products of copper include oxides, sulfates, carbonates and chlorides. The corrosion products are different in different atmospheric environments. But no matter what kind of atmospheric environment, the corrosion products of copper generally contain cuprous oxide, and cuprous oxide is one of the main corrosion products formed on the surface of copper. Therefore, quantitative analysis of cuprous oxide content is very important for the study of copper corrosion. At present, methods that can quantitatively analyze cuprous oxide in atmospheric corrosion products of copper include constant current cathodic reduction method, weight loss and weight gain ratio method, infrared a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 陈卓元李坤刘星辰李亨特孙晓英荆江平孙萌萌
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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