Method for accurately determining content of hydrochloric acid in iron chloride corrosion solution

A technology of corrosive solution and ferric chloride, applied in the field of chemical analysis, to achieve the effect of real and reasonable calculation results, clear titration end point and narrow indication range

Active Publication Date: 2016-01-06
AECC AVIATION POWER CO LTD
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Problems solved by technology

Query hydrochloric acid solution, the relevant one is "Method for Selectively Separating Iron from Hydrochloric Acid Solution Containing Ferric Chloride" patent number: CN201210153853. Related patent content involves the detection of nickel ions in ferric chloride, and the Determination method of iron in hydrochloric acid solution, but does not involve the method of hydrochloric acid content in ferric chloride corrosion solution

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  • Method for accurately determining content of hydrochloric acid in iron chloride corrosion solution
  • Method for accurately determining content of hydrochloric acid in iron chloride corrosion solution

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Embodiment 1

[0037] This embodiment is a method for measuring the content of hydrochloric acid in a superalloy corrosion solution. The technical conditions of the solution are HCl91g / L-126g / L, FeCl3242g / L-300g / L, including the following steps:

[0038] Step 101, use a pipette to accurately draw 10.00 ml of superalloy corrosion solution, place it in a 100 ml volumetric flask, dilute to the mark with distilled water, and shake well. A dilution of the superalloy corrosion solution is obtained.

[0039] Step 102, use a pipette to accurately draw 10.00 ml of the above dilution solution, and place it in a 250 ml Erlenmeyer flask. A dilution of the separated superalloy corrosion solution is obtained.

[0040] Step 103: Add 5.00 ml of ascorbic acid solution and 50 ml of distilled water to the diluent of the superalloy corrosion solution divided into 250 ml of the Erlenmeyer flask. A diluent of the superalloy corrosion solution in which iron ions are reduced to +2 valence is obtained.

[0041] S...

Embodiment 2

[0052] This embodiment is a method for measuring the content of hydrochloric acid in the metallographic corrosion solution of stainless steel. The technical conditions of the solution are HCl66g / L-76g / L, FeCl33g / L-7g / L, including the following steps:

[0053] Step 201, use a pipette to accurately absorb 10.00 ml of stainless steel metallographic crystal decay solution, place it in a 100 ml volumetric flask, dilute to the mark with distilled water, and shake well. A dilution solution of the stainless steel metallographic crystal corrosion solution is obtained.

[0054] Step 202, use a pipette to accurately draw 10.00 ml of the above dilution solution, and place it in a 250 ml Erlenmeyer flask. A dilution solution of the separated stainless steel metallographic crystal corrosion solution is obtained.

[0055] Step 203: Add 5.00 ml of ascorbic acid solution and 50 ml of distilled water to the diluted solution of the stainless steel metallographic crystal decay solution divided i...

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Abstract

The invention belongs to the technical field of chemical analysis, and provides a method for accurately determining the content of hydrochloric acid in an iron chloride corrosion solution. The method comprises the following steps: 1, diluting the iron chloride corrosion solution by distilled water to obtain a diluted iron chloride corrosion solution; 2, sucking up the diluted solution to obtain a sucked diluted iron chloride corrosion solution; 3, sequentially adding an ascorbic acid solution and distilled water to the sucked diluted solution to obtain a diluted iron chloride corrosion solution with iron ions reduced into Fe<2+>; 4, adding 10 drops of a bromocresol green-methyl red indicator to the diluted iron chloride corrosion solution with iron ions reduced into Fe<2+> by using a dropper, and titrating with a sodium hydroxide standard solution until the solution is just green in order to obtain a completely titrated diluted iron chloride corrosion solution; 5, repeating step 2 to step 4 by using distilled water to substitute the diluted iron chloride corrosion solution as a blank experiment; and 6, obtaining the content of hydrochloric acid in the solution.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis, and relates to a technology for accurately measuring the content of hydrochloric acid in a mixed solution of ferric chloride and hydrochloric acid, in particular to a technology for measuring the content of hydrochloric acid in a ferric chloride corrosion solution with relatively high iron content. Background technique [0002] Ferric chloride solution is used for etching of circuit boards and stainless steel, as well as surface treatment processes between processes, before metallographic and fluorescent detection. The main components of the solution are ferric chloride and hydrochloric acid, and it is widely used. [0003] At present, there is no specific method for the determination of hydrochloric acid content in ferric chloride corrosion solution in the national standard and navigation standard. The method that can be found is mainly free acid in industrial ferric chloride, which in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
Inventor 刘朝马静岳航赵勇郭子静
Owner AECC AVIATION POWER CO LTD
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