Aqueous treatment composition for inhibiting corrosion and acid attack on metallic surfaces

An aqueous composition, the technology of the composition, applied in the direction of surface active detergent composition, antiseptic composition, detergent composition, etc.

Inactive Publication Date: 2011-05-04
RHODIA OPERATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, the problem of the appearance of inconvenient foam when using the treatment composition will of course persist, and one of the objects of the present invention is to propose exactly a technical solution to the above problems

Method used

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  • Aqueous treatment composition for inhibiting corrosion and acid attack on metallic surfaces
  • Aqueous treatment composition for inhibiting corrosion and acid attack on metallic surfaces
  • Aqueous treatment composition for inhibiting corrosion and acid attack on metallic surfaces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] A control composition was prepared which was 10% by weight H 2 SO 4 aqueous solution without any other additives.

[0118] Composition 1 was prepared, comprising:

[0119] With 10 wt% H 2 SO 4 , 0.1% by weight of Rhodia under the trade name Stannine An aqueous solution of dibutylthiourea marketed, prepared a composition 2 identical to composition 1, but which also contained 50 ppm of Rhodorsil, sold by the company Rhodia under the trade name Rhodorsil Sales of silicone defoamers.

[0120] Prepare the same composition 3 as composition 1, but it also contains 0.02% by weight sold by Rhodia company under the trade name Polyalkoxylated terpene nonionic surfactants b) sold by HP.

[0121] Immerse in each of the compositions described above up to 35°C a steel pipe having a diameter of approximately 40 mm and a thickness of 3 mm, cut in half lengthwise and the cross-section of which has not been exposed during a defined period of immersion Corrosion protection and t...

Embodiment 2

[0127] A synergy exists between thiourea derivatives and polyalkoxylated terpene nonionic surfactants is revealed.

[0128] Compositions 1, 2 and 3 of Example 1 above were used and Composition 4 was prepared identical to Composition 1, but with Stannine The content is 0.2% by weight.

[0129] In each of the above-mentioned compositions 1, 2, 3 and 4 up to 35°C, a steel pipe having a diameter of about 40 mm and a thickness of 3 mm, cut in half in the length direction and the cross-section of which was immersed During 27 days it was not protected against corrosion and the weight loss of the tubes in % weight loss was measured at the end of these 27 days.

[0130] The results are summarized in Table 2 below:

[0131] Table 2

[0132]

[0133] As can be seen from Table 2, The combination has a synergistic effect than that used alone Stronger anti-corrosion effect, even with 2 times the dosage.

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Abstract

The present invention relates to an aqueous treatment composition for inhibiting corrosion and acid attack on metallic surfaces that comprises a thiourea organic derivative, a polyalkoxylated terpene nonionic surfactant and an acid. The invention also relates to a process for cleaning industrial metallic equipment, in particular heat exchangers in which a heat transfer fluid, generally based on air or on water, flows, with a view to cleaning them and removing scale and other soiling.

Description

technical field [0001] The present invention relates to aqueous compositions for the inhibiting treatment of acid attack (attaque) and corrosion on metal surfaces. The invention also relates to a method for the treatment of metal surfaces by means of a composition according to the invention, in particular by pickling (décapage acid), also known in English as “acid pickling”. Background technique [0002] In most industrial establishments such as refineries, steelworks, processing of bauxite and the like, mining equipment, there are heat exchangers for cooling equipment operating on long cycles of varying temperatures through which air circulates Or a heat-carrying fluid such as water. The removal of heat takes place by the passage of the fluid in pipes, which are usually made of steel or iron-based alloys. [0003] In order to avoid the accumulation of scale, dirt, sludge, algae, salt and various deposits in these pipes, an acidic treatment composition is periodically circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06C23G1/08C11D3/20C11D11/00
CPCC02F5/00C02F2303/08C11D1/72C11D3/0073C11D3/349C23F11/04C23G1/06C23G1/081C25D5/34F28F19/00F28G9/00
Inventor J-E·扎内托
Owner RHODIA OPERATIONS SAS
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