The performance and characteristics of water treatment corrosion inhibitors
1. Passivation membrane type corrosion inhibitor:
Such inhibitors are oxidant, the metal surface oxidation generating a layer of continuous and compact containing gamma -Fe2O3 with anti-corrosion function of passivation film, can be spread in the adjacent zone and achieve the goal of the corrosion. Typical is the chromate, nitrite. But because of the toxicity has two basic no, only the nitrite for closed circulating cooling water, replace sb. is Molybdate, Tungstate and Tungsten Heteropoly Acid. This kind of corrosion inhibitor are often large amount, because if the amount is not enough, not enough to make the anode passivation is all, corrosion will be concentrated in unpassivated complete parts, causing dangerous pitting.
2. Precipitation membrane type corrosion inhibitor:
Membrane type inhibitor is with ion reaction medium in the formation of precipitation, membrane on the metal surface. Although the precipitation film thickness ratio of the film thickness, but dense, adhesion is poor, so the corrosion effect is not as good as the passivation film, but because of the amount of corrosion inhibitor was small and the price is cheap, it should be used with especially on research and application of phosphorus corrosion inhibitor is most active. Such as: MBT, BTA and TTA and so on.
3. The adsorption film type corrosion inhibitor:
The class are organic compounds, the molecular structure containing both adsorption and hydrophobic group, in directed metal surface adsorption group, hydrophobic group to form a layer of shielding or barrier layer in the periphery, the metal surface and metal ions and dissolved oxygen isolation, inhibited the corrosion of metals. When cleaning the metal surface is active, the adsorbed films exhibit a corrosion prevention effect is good, but if the metal surface corrosion products covered or deposit, to provide appropriate conditions cannot form corrosion film.
4. Compound corrosion inhibitor:
At present, because of the various series of corrosion defects inhibitor itself, so its application is limited, in order to better inhibition effect is obtained, the synergy principle, both at home and abroad, and has been widely used in corrosion composite corrosion inhibitor in water treatment to control equipment.
Now, the whole organic formula because of no pollution, no hydrolysis of poly P, no risk of calcium phosphate scale, water quality suitable for high PH, high alkalinity, high hardness and high concentration ratio, it is applied widely.
Such inhibitors are oxidant, the metal surface oxidation generating a layer of continuous and compact containing gamma -Fe2O3 with anti-corrosion function of passivation film, can be spread in the adjacent zone and achieve the goal of the corrosion. Typical is the chromate, nitrite. But because of the toxicity has two basic no, only the nitrite for closed circulating cooling water, replace sb. is Molybdate, Tungstate and Tungsten Heteropoly Acid. This kind of corrosion inhibitor are often large amount, because if the amount is not enough, not enough to make the anode passivation is all, corrosion will be concentrated in unpassivated complete parts, causing dangerous pitting.
2. Precipitation membrane type corrosion inhibitor:
Membrane type inhibitor is with ion reaction medium in the formation of precipitation, membrane on the metal surface. Although the precipitation film thickness ratio of the film thickness, but dense, adhesion is poor, so the corrosion effect is not as good as the passivation film, but because of the amount of corrosion inhibitor was small and the price is cheap, it should be used with especially on research and application of phosphorus corrosion inhibitor is most active. Such as: MBT, BTA and TTA and so on.
3. The adsorption film type corrosion inhibitor:
The class are organic compounds, the molecular structure containing both adsorption and hydrophobic group, in directed metal surface adsorption group, hydrophobic group to form a layer of shielding or barrier layer in the periphery, the metal surface and metal ions and dissolved oxygen isolation, inhibited the corrosion of metals. When cleaning the metal surface is active, the adsorbed films exhibit a corrosion prevention effect is good, but if the metal surface corrosion products covered or deposit, to provide appropriate conditions cannot form corrosion film.
4. Compound corrosion inhibitor:
At present, because of the various series of corrosion defects inhibitor itself, so its application is limited, in order to better inhibition effect is obtained, the synergy principle, both at home and abroad, and has been widely used in corrosion composite corrosion inhibitor in water treatment to control equipment.
Now, the whole organic formula because of no pollution, no hydrolysis of poly P, no risk of calcium phosphate scale, water quality suitable for high PH, high alkalinity, high hardness and high concentration ratio, it is applied widely.
stevia - 19. Nov, 06:55
