Natural seawater molybdate carbon steel composite corrosion inhibitor

A composite corrosion inhibitor and molybdate technology, applied in the field of carbon steel corrosion inhibitors, can solve problems such as limited effect, and achieve the effects of inhibiting adsorption, high corrosion inhibition efficiency, and inhibiting pitting corrosion

Inactive Publication Date: 2015-12-23
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the protective film formed by molybdate corrosion inhibitors is not very dense, and the effect of preventing the erosion of chloride ions in seawater is limited; and when molybdate is used alone, its concentration must be high to achieve good corrosion inhibition.

Method used

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  • Natural seawater molybdate carbon steel composite corrosion inhibitor
  • Natural seawater molybdate carbon steel composite corrosion inhibitor
  • Natural seawater molybdate carbon steel composite corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0024] A composite corrosion inhibitor for molybdate carbon steel in natural seawater, consisting of the following components: calcium gluconate 100mg / L, zinc sulfate 100mg / L, sodium polyphosphate 20mg / L, benzotriazole 40mg / L L, sodium molybdate is respectively 20mg / L (embodiment 1), 40mg / L (embodiment 2), 60mg / L (embodiment 3), 80mg / L (embodiment 4), 100mg / L (embodiment 5 ). The above components were mixed and stirred for 20 minutes, then dissolved in 1L of seawater, and the carbon steel material was soaked in seawater at 25°C with the addition of a composite corrosion inhibitor for 15 days.

[0025] After immersion, calculate the corrosion inhibition efficiency according to the method described in the national standard GB / T18175-2000 of the People's Republic of China, specifically: according to the change of the sample weight before and after the experiment, calculate the corrosion rate by the weight loss method, so as to Determine the corrosion resistance of metal material...

Embodiment 6～10

[0035] A composite corrosion inhibitor for molybdate carbon steel in natural seawater, consisting of the following components: sodium molybdate 20mg / L, zinc sulfate 100mg / L, sodium polyphosphate 20mg / L, benzotriazole 40mg / L L, calcium gluconate is respectively 60mg / L (embodiment 6), 80mg / L (embodiment 7), 100mg / L (embodiment 8), 120mg / L (embodiment 9), 140mg / L (embodiment 10 ). The remaining steps are the same as in Examples 1-5, and the measurement results of the corrosion inhibition rate are recorded in Table 2. It can be seen from the results that when the amount of sodium molybdate added is 120mg / L, the corrosion inhibition effect is the best, and the corrosion inhibition efficiency reaches 86.4%.

[0036] Table 2

[0037] Example

Embodiment 11～15

[0039] A composite corrosion inhibitor for molybdate carbon steel in natural seawater, consisting of the following components: sodium molybdate 20mg / L, sodium polyphosphate 20mg / L, calcium gluconate 100mg / L, benzotriazole 40mg / L, zinc sulfate is respectively 60mg / L (embodiment 11), 80mg / L (embodiment 12), 100mg / L (embodiment 13), 120mg / L (embodiment 14), 140mg / L (embodiment 15 ). The rest of the steps are the same as the implementation series 1, and the rest of the steps are the same as in Examples 1-5, and the measurement results of the corrosion inhibition rate are recorded in Table 3.

[0040] table 3

[0041] Example

[0042] It can be seen from the results that in Examples 11-15, when the amount of zinc sulfate added is 120 mg / L, the corrosion inhibition effect is the best, and the corrosion inhibition efficiency reaches 83.6%.

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Abstract

The invention relates to a natural seawater molybdate carbon steel composite corrosion inhibitor, which is characterized in that per liter of the seawater comprises 20-100 mg of sodium molybdate, 60-140 mg of calcium gluconate, 60-140 mg of zinc sulfate, 20-100 mg of sodium polyphosphate, and 20-100 mg of benzotriazole.

Description

technical field [0001] The invention relates to a carbon steel corrosion inhibitor, in particular to a molybdate carbon steel composite corrosion inhibitor used in natural seawater to slow down the corrosion of carbon steel materials by seawater. Background technique [0002] Due to the shortage of fresh water resources in our country, the development and utilization of marine resources have been continuously intensified. In the field of industrial cooling water, seawater has been used in large quantities as circulating cooling water in circulating cooling systems. This not only alleviates the contradiction between the shortage of fresh water resources and industrial development, but also It has the advantages of low cost, good cooling effect, and simple operation and management. However, due to the high salt content and complex composition of seawater, it will inevitably lead to metal corrosion in actual use. At present, whether it is from an economic point of view or from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/08
Inventor 付强杨小刚李斌苏伟陈天生范圣平王梦君梁华杰钱艺华刘世念卢国华魏增福郑颖曦
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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