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Method for evaluating the affection of water treatment agent to corrosion-resistance of stainless steel

A technology of water treatment agent and corrosion resistance, which is applied in the fields of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc. It can solve the problems that the pitting potential range of blank water samples has not been clearly specified, and has not been clearly pointed out, so as to achieve Prevent misjudgment and missed judgment, improve the effect of resolution

Inactive Publication Date: 2005-02-16
梁磊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Literature [3] also uses the level of pitting potential to evaluate the pitting corrosion resistance of stainless steel in water samples containing these water quality stabilizers, but it does not clearly indicate whether the pitting corrosion resistance here can represent the corrosion resistance or not. The pitting potential in the blank water sample is not used as the benchmark for comparison, and the range of the pitting potential in the blank water sample is not clearly defined

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1, the evaluation of the corrosion inhibition effect of three scale and corrosion inhibitors on the stainless steel tube condenser in the circulating cooling water of Q power plant.

[0015] The cooling pipes of the condensers of the two 350MW units of the Q power plant are all 304 stainless steel pipes, and the concentration ratio of the circulating cooling water is about 2. The plant plans to implement "zero discharge" of wastewater, and increase the concentration ratio to more than 4. It is required to evaluate the corrosion inhibition effect of three scale and corrosion inhibitors a, b and c on the stainless steel tube condenser in the circulating cooling water of the plant. The assessment steps are as follows:

[0016] 1. Use the effect of scale and corrosion inhibitors on the pitting resistance of stainless steel to evaluate the corrosion inhibition effect of the agent on stainless steel.

[0017] 2, select two kinds of blank water samples, one is the act...

Embodiment 2

[0024] Example 2, evaluating the influence of four water treatment agents on the corrosion resistance of stainless steel pipes used in condensers in the cooling water of W power plant.

[0025] The cooling water of the condenser of the original unit of the W power plant is a straight-line type. With the increasing shortage of water resources, in order to save water and use water reasonably, the cooling water of the condenser of the new unit has been changed to a circulating type. The cooling pipe of the condenser Also changed from copper tube to 304 stainless steel tube. The plant and the water treatment agent supplier requested to evaluate the influence of the four water treatment agents on the corrosion resistance of stainless steel pipes used in condensers in the cooling water of the plant. The assessment steps are as follows:

[0026] 1. The effect of the cooling water treatment agent on the pitting corrosion resistance of stainless steel represents the effect of the agen...

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Abstract

The invention refers to a method that assesses the effect of the water-treatment agent, the cooling water, on the stainless-steel corrosion-resisting performance. It uses the point-corrosive electric potential of the stainless steel in the blank and non-blank water sample to characterize the effect, and at least has a kind of blank water sample in which the point-corrosion electric potential of the stainless steel is within 300-900 mV, and 580 minus or plus 10mV is preferential.

Description

technical field [0001] The invention relates to a method for evaluating the influence of a water treatment agent on the corrosion resistance of metal materials. Background technique [0002] With the increasing shortage of water resources, in order to save water and use water rationally, the concentration ratio of circulating cooling water is constantly increasing. The contradictions of scaling, corrosion, and biological hazards are becoming increasingly prominent. Various water treatment agents are used more and more in cooling water, and stainless steel is also increasingly used for heat transfer elements of heat exchangers in cooling water systems, especially cooling pipes for condensers in thermal power plants. About 70% of the condensers in the United States use stainless steel tubes, and the power plants using stainless steel tube condensers in my country are also increasing rapidly. Some water treatment agents have corrosion inhibition effect on metal materials, som...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00G01N17/02
Inventor 梁磊
Owner 梁磊