SE502650C2 - Aq.-chemical cleaning compsn. - Google Patents

Abstract

An improved aq. chemical cleaning compsn. for removing organic and inorganic combustion residues from steel prods. meets the hydrogen embrittlement potential test set forth in ANSI/ASTM F519-77. Also claimed is a dilute aq. substantially freeze resistant chemical cleaning compsn. for removing organic and inorganic combustion residues from steel prods. at temps. below 0 deg.C and dilute aq. chemical cleaning compsn., a method of cleaning the compressor gas path of a gas turbine which has parts of high strength steel and cleaned high strength steel part of the gas turbine part.

Description

l0 '-1 Lu 20 25 30 35 40 502 650 2 the machine can be avoided when the ship is at sea, as this type of machine overhaul entails costly time losses, especially for larger ships.

Routine engine overhaul as well as cleaning is necessary at prescribed time intervals, not only to reduce wear of the machine parts but to the same extent to reduce fuel consumption. In a soiled engine, there is a significant increase in fuel consumption, partly due to the combustion chamber geometry and attached ducts undergoing changes in connection with the sediments being deposited and accumulating and partly due to wear of the parts and accompanying leakage and due to the fact that the valve and become prone to leakage, thereby overdosing on the fuel or altering the combustion process in other ways, but primarily as a result of reduced oxygen supply as a result of the machine's air supply system becoming soiled.

The most important improvements in the art in question are disclosed in British Patent 1,342,077. This patent discloses a composition comprising a cationic or nonionic surfactant, suitably an ethoxylated amine such as Ethomeen (manufacturer Armor and Company Chemical Division) and high boiling tar acids having a boiling range of 200 -280 ° C, especially cresylic acid together with deionized or demineralized water and acetic acid for pH adjustment purposes. This special cleanser has been used successfully since its introduction. However, it has the disadvantage that it is not possible to guarantee cleaning of gas turbines when the turbines in question are hot, i.e. at idle or operating mode. The following U.S. patents have been considered: 3,535,160, 2,955,047, 293,711, 2,671,036, 2,471,390, 2,356,747, 2,347,983 and 2,032,174. However, these patents are not relevant to the present invention. development. In 1977, The American Society for Testing and Materials published a standard called ANSI / ASTM F 519-77 for testing mechanical embrittlement and hydrogen embrittlement with respect to metal coating processes and aircraft maintenance chemicals. Prior to the present invention, no commercially available combined hot engine cleaner meets the standard set forth in the present protocol. It is well known that when extremely hot steel materials are exposed to certain aqueous solutions smaller amounts of hydrogen are formed, which in turn causes embrittlement of the steel. Of course, it is superfluous to add that the embrittlement in question can have catastrophic consequences on the gas turbine, especially when used as aircraft engines. A complete overview of this area can be found in an article entitled Whitney Award Lecture of 1987, R.A.

Oriani (Corrosion 390, 1987).

The ASTM test in question has been included as a reference. This is also the case for the specified article.

Some largely marketed solvent-based or aqueous solutions for cleaning gas ducts in turbine engines require cooling of the machine. See, for example, Bulletin G28M, B&B Chemical Inc; whereby B & B 3100 is convened, i.e. a cleaning composition, which requires cooling of the engine to 66 ° C (150 ° F) before application of the cleaning solution. The aqueous detergent in question is stated to be useful both at idle and at operating mode for gas turbines.

Aeromarin TC 200 (American Aeromarine Inc, Fort Lauerdale, FL) is useful for both operating and idle gas turbines. The ASTM specification is not claimed and the use of deionized water is indicated as necessary in the form of 5.0 micromho or more.

The Peneton 19 gas turbine compressor cleaner (Amerace - Corporation of Tenafly, New Jersey) is designed to be useful in connection with cleaning at the turbine engine inlet. It is quite clear that unspecified when used regarding idle mode or operating mode, and a final water rinse is recommended. The Rochem "GTE-CC" Fyrewach system claims to be useful for gas turbines in aircraft at operating mode. Published specifications do not claim to meet specified ASTM standards. The chemical compositions with the indicated cleaning agents are currently commercially available, the agents other than those corresponding to the preceding patent not being any publicly known products.

A cleaning solution prepared on the basis of the stated British patents was found in the test according to the test ASTM F-S19 to cause breakage of the test rods after 8-10 hours. Since the ASTM test stipulates that violations must not occur within less than 150 hours, the solution does not meet the prescribed standard.

Summary of the Invention An improved aqueous chemical cleaning composition developed for the removal of organic and inorganic combustion residues from steel products, which meets the test for hydrogen embrittlement potential according to ANSI / ASTM F 519-77.

The composition consists in concentrated form predominantly of A) ethoxylated amines of formula - (1CH 2 CH 2 O) XH 1 NR 1 (cnzcego) YH wherein R is an alkyl group having 6-20, preferably 12-18 carbon atoms, x and y are integers , the sum of which varies between 2 and 50, preferably between 8 and 20, especially between 14 and 16; B) ethylenediaminetetraacetic acid (EDTA) and C) demineralized water with a conductivity of or below 0.9 micromho.

The concentrated composition suitably contains mineral ions, which are less than (in parts by weight per million): lead 0.5, sodium 5, potassium 3, silica 1, zinc 0.9, manganese 0.05, iron 1 and phosphorus 5. In this concentrate it exceeds the oxidized amine content by 25% by weight, the EDTA content is between 0.1 and 1.5% by weight, preferably more than about 0.5% by weight, the remainder being the demineralized water, the content of which exceeds 4% by weight so that a total of 100% by weight is obtained. - cent. The concentrated composition has a pH in the range of about 7 to about 9 and can be obtained in the range of about 7 to about 7.5 or in the range of about 8.1 to about 9.

It is understood that on the basis of the invention some deviation from the stated values is permitted, provided that the composition satisfies the stated ASTM tests. 10 20 25 30 35 40 S 502 650 The stated composition has a preferred content; of course, however, the invention implies that the composition may be more concentrated, whereby the mineral ion content (together with other solids) will be correspondingly higher, and that the opposite occurs when the content is more dilute, whereby the mineral ions content (together with other solids) is correspondingly lower.

The improved cleaning composition is normally transported in concentrated form. While the concentrate satisfies the hydrogen embrittlement potential test according to ANSI / ASTM F 519-77, it was used in dilute form, which also meets the hydrogen embrittlement potential test according to ANSI / ASTM F 519-77. In order to comply with the standard in question, dilution must be carried out with water which complies with the stated conductivity and preferably also the standard for the mineral content. Suitably the dilute aqueous composition contains between 25 and 35 g of the concentrated composition per 1 dilute composition in total. Permissible pH varies for the diluted composition as previously indicated for the concentrate.

The object of the invention also comprises a diluted aqueous, almost freeze-resistant chemical cleaning composition for removing organic and inorganic combustion residues from steel products at ambient temperatures below 0 ° C, and which consists predominantly of: A) a concentrated component predominantly consists of ethoxylated amines, ethylenediaminetetraacetic acid (EDTA) and demineralized water with a conductivity of or below 0.9 micromho as previously indicated: B) sufficient antifreeze selected within the group based on lower alkanols having 1-6 carbon atoms plus lower alkylene glycols, wherein the term lower alkyl refers to a chain having 2-6 carbon atoms, suitably selected from the group based on methanol, ethanol and ethylene glycol and C) demineralized water which satisfies the stated standard. The diluted composition in question enables freezing resistance under conditions of the surrounding environment and still satisfies the hydrogen embrittlement potential test according to ANSI / ASTM F 519-77. The diluted aqueous almost freeze-resistant composition suitably contains between 20 and 25% by weight of antifreeze. It also exhibits a pH in the range of about 7 to about 9 and may have a pH in the range of about 7 to about 7.5 or in the range of about 10 20 25 30 35 502 650 6 8.1 to about 9. The dilute aqueous almost freeze-resistant composition contains between 25 and 35 g of component A) per 1 composition in total.

The new compositions of the present invention previously discussed can be used for treating steel components, especially in engine parts. A particularly useful process involves cleaning the compressor gas ducts in a gas turbine which has high strength steel parts and which is in need of being freed from organic and inorganic combustion residues, while the turbine is hot and running, thereby injecting into the turbine a pressurized flow of any of the indicated compositions, suitably in dilute form, with or without antifreeze, as required in the individual case, whereby the residues on the parts in question are washed away.

This cleaning method can be used in such a case when the operating position of the turbine corresponds to idle mode and the applied pressure of the cleaning agent is between about 45 and about 50 psi. In such a case when the operating position corresponds to the operating position, the applied pressure is suitably between about 50 and about 100 psi.

The stated method of cleaning the compressor gas ducts in the gas turbine while the turbine is hot offers the advantage that the new compositions according to the invention can flow through the turbine and, while leakage can occur from other turbine components made of materials other than high-strength steel located in in the vicinity of the turbine (ie the landing gear of the aircraft), such leakage can occur without adversely affecting the nearby components.

The use of specified cleaning compositions is not limited to cleaning a turbine during operation. All steel parts can be cleaned with the composition. No flushing step is required. When a high-strength steel part is cleaned of inorganic and organic combustion residues by applying one of the specified compositions to it, it is made possible in addition to the cleaning that it meets the hydrogen embrittlement potential test according to ANSI / ASTM F 519-77. Since no rinsing step is required, a residual protective film is formed on the surface in connection with drying of the part, suitably in the form of a monomolecular residual protective layer. Such parts may, for example, refer to gas turbine components such as gas turbine blades or other engine parts such as the diesel engine part.

It is clear that the present composition is quite suitable as milder claims can be accepted than those based on specified ASTM tests.

Description of Preferred Embodiments The new concentrated chemical cleaning compositions are an improvement over preparations for this purpose previously marketed. The type of material in question is disclosed in British Patent 1,342,077. A fundamental difference between the composition according to the invention and that of the prior art is that the mixture according to the prior art contained complex mixtures of high-boiling tar acids derived from the intermediate fraction by distillation of carbon tar by reaction with sodium liquor. of recovery by purification of the aqueous solution by acidification. The tar acids in question are a complex mixture of diethylphenol / methyl-substituted dihydric phenols / propyl and / or butylphenols / indenols / naphthols and tetraols with a boiling point in the range 230 ° C-280 ° C.

According to the invention, ethylenediaminetetraacetic acid can be used in an amount corresponding to about 0.55% by weight of the concentrated composition. This refers to about 1/10 of the weight of the high-boiling tar acids. The remaining subset consists of deionized and demineralized water. As previously stated, the pH of the concentrate can be adjusted to the desired level, which is from about pH 7 to about pH 9, by adding acid, preferably organic acid, especially a lower alkanoic acid having 2-6 carbon atoms such as acetic acid. None of the high-boiling tar acids were used.

The ethoxylated amines used in the present invention can be obtained through a large number of outlets in the United States as well as in other parts of the industrial world. One can use, for example, ethoxylated amines, manufactured by Croda Chemical Ltd, North Humberside, England under the tradename "Crodemets"; by Lankro Chemicals, Ltd, Manchester, England, under the trade names "Ethylan", in particular "Ethylan TC" and "Ethylan TT-15". Rohm and Haas Company Philadelphia PA, market surfactants of this type under the trade names "Triton RW", "Triton RW-100" is particularly suitable, as are surfactants suitable under the tradename "Ethomeen", especially "Ethomeen C-25", manufactured by Armor and Co., Chemical Division of Chicago. Ethomeen The C-25 contains an average of 15 moles of ethylene oxide, the fatty acid component of Ethomeen being a mixture of C8 to C18 acids having about 50% by weight of lauryl (C12) groups and about 20% by weight of myristyl (C14) groups.

The mineral ion content of both the prior art composition and the compositions of the present invention has been analyzed. The prior art compositions do not meet the ASTM F 519-77 standard, while the compositions of the present invention actually meet this standard. Analysis data, which appear from Table I which follows, refer to an illustrated mineral content with regard to what can be thought to be normally found in products according to prior art and in products with the new compositions- F18 .. 10 15 20 25 30 35 40 9 502 050 Table I Mineral ion content 000 ~ ~. 2 -_ _ ppm ëâgëàltyp:; áɧp šëgšw Éïgâp à ::: §fgtypF§: ÜÉç§ - - "A" i "2- * .. w Cl 0,2 <0,2 _. __ 0 , 05_ __ Na 1.6 '0.55 <0, s <0.s 0.10 0.07 K 0.44 0.06 0.69 V <0.0s 0.22 0.04 Pb 0.52 0.06 '0.11 0.22 0.014 V <0.0l PI 0.005 <0.05 <0, s <@: 5 Ofbos Fe 1:28 0:36 0.48 0.27 0 030 Sn 0.7 si Al 0.2 0.2 _ 0.000 Cu 0.50 0.03 __ _ 0] 0l¿ Mn 0101 <°> U1 <0105 <0.0s 00005 Ca <0.0l <0.1 <0.50 < 0.50 M9 0.03 0.01 _. __ O 002 Zn _. _- 0.69 0.69 Conc, old type: rinse concentrate according to UK Patent; Conc, new type "A": rinse concentrate according to the invention; Conc, EtOA "1": a first commercial sample of ethoxylated amine; Conc, EtOA "2": a second commercial sample of ethoxylated amine; Solution old type: dilute solution of rinse concentrate according to UK Patent; Solution new type "A": dilute solution of rinse concentrate according to the object of the invention.

Results of comparative tests are as follows: l0 15 20 25 30 35 40 502 650 10 Test of detergent of previous type Examined substance: 800 ml R-Mc, concentrate ready to use.

Purpose of the study: test for Douglas CSD # 1 hydrogen embrittlement.

Method: American Society for Testing and Materials ASTM F 519, type lc.

Test results Three rods, which have been prepared and tested in accordance with the standards ASTM F 519, type lc, showed processes for material breakage that follow.

Rod 1 Fracture 8 hours Rod 2 Fracture 16 hours Rod 3 Fracture 10 hours Due to material breakage within less than the 150 hours prescribed by ASTM F 519, the product is not acceptable for aircraft use.

Test of product according to Example I Substance tested: R-Mc G-21, concentrate ready to use.

Purpose investigated: testing of Douglas CSD # 1 hydrogen embrittlement.

Method; American Society for Testing and Materials ASTM F 519, typ ic.

Test results Three rods were prepared and tested for the requirements of ASTM F 519, type lc, obtaining the following results: Rod 1 Non-existent rupture 150 hours Rod 2 Non-existent rupture 150 hours Rod 3 Non-existent rupture 150 hours Because material rupture did not occur within less than For 150 hours, as prescribed in ASTM F 519, the product was acceptable for use in aircraft. Since separate experiments have shown that the compounds of the invention meet the ASTM standards provided that the water used in both concentrates and dilute formulations of the cleaning composition does not exceed the conductivity of 0.9 microns. , the low mineral content of the composition as a whole can be considered critical. The present compositions are normally transported in the form of concentrates and then diluted with demineralized water or, in cases where environmental conditions so require, with demineralized water and a suitable antifreeze, preferably methanol, ethanol or ethylene glycol, for the detergent to function. . A large number of other freezing point depressants can also be used, provided that the ASTM test is met.

A principled, but not limited use of the dilute aqueous compositions involves washing the gas turbine. The cleaning compositions are injected into the turbine, which can be either idle or operating mode, by methods known per se in the art, however, special reference is made to what appears from the technical manual, published by the company Ivar Rivenaes A / S of Bergen, Norway. Reference may also be made to technical tables, which relate to the way in which the prior art product (designated R-MC) was used, and which have been published by ECT Incorporated of King of Prussia, PA and designated R1 to R5, all references being given as references. The methods stated in this connection are equally applicable to the new preparations according to the invention.

Some washing conditions require different pH values for the cleaning products. Thus, assuming that the solutions normally have a pH in the range of about 7 to about 9 (or the corresponding acid number), the pH can be easily adjusted with any of the indicated acids to the desired value.

It will be appreciated by those skilled in the art that a gas turbine gives rise to a different internal pressure level at idle mode than at operating mode.

In the former case the pressures are lower than in the latter case.

Thus, the cleaning solutions must be injected with sufficient overpressure to enable the engine to flow through, since it is required that the cleaning preparations be injected when the gas turbine is running, which suitably takes place in the corresponding compressor section. At idle, a relatively low internal suction pressure occurs in the turbine. For that reason, an applied pressure of about 45 to about 50 psi is required to press through the cleaning composition. If, on the other hand, the turbine is in operating mode, a greater pressure arises and an applied pressure of only about 50 to about 100 psi is required.

The present cleaning solutions can also be used to clean other existing steel components, including the high-strength steel component, for example those used in carbon motors of the dicslar type. In cases where the components are to be cleaned, either the component as such can be heated or the solutions as such can be heated and sprayed on the component to be cleaned with a suitably high spray pressure, either washing the components alone or washing the components with participation. of brush devices.

The following examples illustrate the invention without thereby limiting it.

Example I Composition for gas turbine / engine wash Ethoxylated aminesl 2.622 kg Demineralized water 116.2 kg EDTA 15.2 kg Total 27.53.4 kg 1 of the previously stated type.

Of the specified concentrates, 3.53 kg corresponds to 110 l of working solution when used above approx. + 5 ° C. Under conditions below + 5 ° C, but above -20 ° C, between 20 and 25% of the final product is ethylene glycol.

According to the indicated product composition, however, using Ethylan TC instead of Ethomeen C25, a product of similar quality was obtained. In a similar manner, in accordance with the stated composition, but using ascorbyl palmitate instead of EDTA, a product of similar quality was obtained.

A number of different substitutions can be made by those skilled in the art, and likewise different amounts can be used, leading to a final composition which meets the ASTM test. 10 20 25 30 35 40 “I 13 Û M2 Example II Use of detergents intended for turbine engines in aircraft The cleaning fluid (diluted) according to Example I is filled with an RM-C compressor, which is fitted with a 25 gallon tank and spray nozzle. Spray nozzle is attached to the suction of a hood of a Rolls Royce Dart machine with 2 hood clamps.

The rinsing rig is located under the wingtip of the aircraft, and the hose is attached to one landing site. 6 gallons of detergent are filled into the tank, which is then closed. The engine is then started and run at 8000 rpm with 100% fuel setting. The compressor is started and the cleaning agent is injected at a rate of 1.5 gallons / min at 40 psi. The engine speed drops to 7000 rpm when injected. After 4 minutes, the compressor is switched off. The engine speed then increases to 8000 rpm. When the cleaning agent stops flowing from the engine, the engine is switched off, the spray nozzle is removed and the engine is allowed to run at 13,000 rpm with a fuel setting of 0% for 15 minutes. The engine is then switched off.

It is recommended that the aircraft's gas turbine be washed using the specified method with an average interval of 150 operating hours. This allows you to increase the time allowed between the required overhaul with maintenance and demonstration to about 2500 hours.

Of course, the invention includes that all common additives or constituents or components may be added to the composition, provided that the final concentrated or dilute composition meets the requirements of the ASTM test in such applications when the test standards must be met.

From the stated description it should be clear that the present invention constitutes an important technical contribution, especially with regard to the safety of aviation operations and space operations in commercial and other applications. As described in the above-mentioned Witney Award Lecture, the harmful effects of hydrogen on steel materials cause blistering and flaking. Both cases can arise from stresses that have arisen through the precipitation of dissolved hydrogen during the cooling process of the steel from hot working temperature. Blisters can also be caused by hydrogen supply to steel at applied cathode current or in connection with corrosion reactions. In all cases, internally dissolved hydrogen with extremely high thermodynamic activity arises, whereby gaseous molecular hydrogen is separated with very high volatility at already existing microcracks and nooks and crannies in the steel. Consequently, large mechanical pressures of the hydrogen gas aggravate the material defects in the steel by plastic deformation or splitting.

It is clear that hydrogen exhibits risky and extremely unfavorable processes in steel materials, which come insidiously, and thereby offers through the invention a technical contribution in solving this real problem as well as common safety issues.

Claims (19)

10 15 25 25 30 35 40 iá '502 650 Patentkrav A concentrated form composition for removing organic and inorganic combustion residues from steel products, the cleaned steel products meeting the hydrogen embrittlement potential tests according to ANSI / ASTM F 519-77 and consisting predominantly of ethoxylated amines of formula (çnHc NR 1 (cnzcnzo) y fi wherein R is an alkyl group having 6-20 carbon atoms and x and y are integers the sum of which is in the range of 2 to 50, ethylenediaminetetraacetic acid (EDTA) and demineralized water having a conductivity of or below 0.9 microns, wherein The EDTA content is between 0.1 and 1.5% by weight. Composition according to Claim 1, characterized in that x + y is an integer in the range 8 to 20. Composition according to Claim 2, characterized in that x + y has an average value of 14-16. A composition according to claim 1 having a pH in the range of about 7 to about 9. The composition of claim 1 having a pH in the range of about 7 to about 7.5. The composition of claim 1 having a pH in the range of about 8.1 to about 9. 7. A composition according to claim 1, characterized in that the content of ethoxylated amine exceeds 95% by weight. and that the EDTA content exceeds 0.5% by weight. and that the content of demineralized water exceeds 4% by weight. to a maximum of 100% by weight. Composition according to Claim 1, with mineral ions in small amounts with a parameter that follows in parts by weight per million: Lead 0.5 Sodium 5 Potassium 3 Silica 1 10 15 20 25 30 35 40 502 650 I ß Copper 0.5 Manganese 0.05 Iron Phosphorus Concentrated aqueous chemical cleaning composition according to any one of the preceding claims, predominantly consisting of ethoxylated amines of formula (C 13 H 2 CH 2 O) XH I NR I (c fl zcnzo) YH wherein R is an alkyl group having 12-18 carbon atoms and x and y are integers whose sum is in the range between 14 and 16, ethylene tetraacetic acid (EDTA) and demineralized water with a conductivity of or below 0.9 micromho, the composition contains mineral ions in a number of less than a few parameters per unit weight: Lead 0.5 Sodium 5 Potassium Silica Copper OUI Manganese Iron UIP- * OOP- * w Phosphorus with EDTA content exceeding 0.5% by weight. and the content of demineralized water exceeds 4% by weight. to a total of 100 weight percent. Diluted aqueous composition with 25 to 35 g of a composition according to claim 9 per 1 composition in total together with demineralized water meeting the specifications of claim 9, for removing organic and inorganic combustion residues from steel products wherein the cleaned steel products meet hydrogen emission potential test. the standards according to ANSI / ASTM F 519-77. 11. ll. Diluted aqueous cleaning composition for removing organic and inorganic combustion residues from steel products, wherein the cleaned steel products meet the hydrogen embrittlement standards of ANSI / ASTM F 519-77, and comprising: A) A concentrated component consisting predominantly of ethoxylated amines of formula (CH2CH2O) 1H in NR 1 (cnzcnzo) yH wherein R is an alkyl group having 6-20 carbon atoms and x and y are integers the sum of which is in the range of 8 to 20, ethylenediaminetetraacetic acid ( EDTA) and demineralized water with a conductivity of or less than 0.9 micromho, the EDTA content exceeding 0,5% by weight. and the content of demineralized water exceeds 4% by weight. to a total of 100 weight percent. of the concentrated component and B) Demineralized water that meets the specified specifications according to A). 12. Diluted aqueous almost completely freeze-resistant chemical cleaning composition for the removal of organic and inorganic combustion residues from steel products at ambient temperatures below 0 ° C, which consists predominantly of A) A concentrated component consisting essentially of ethoxylated amines of formula: (? H2CH2O) XH 3 TR (cH2cH2o) yn wherein R is an alkyl group having 6-20 carbon atoms and x and y are integers ranging from 8 to 20, ethylenediaminetetraacetic acid (EDTA) and demineralized water having a conductivity of or less than 0,9 micromho, the EDTA content exceeding 0,5% by weight. and the content of demineralized water exceeds 4% by weight..to a total of 100% by weight. of the concentrated component, B) Freezing point depressants in sufficient quantity, selected within the group on the basis of lower alkanols having 1-6 carbon atoms and lower alkyl 10 15 20 25 30 35 40 502 650/3 long glycols, the designation of lower alkylene radicals having 2-6 carbon atoms and C) Demineralized water that meets the specified specifications according to (A), wherein the diluted composition is such that it is resistant to freezing under ambient conditions and that the cleaned products still meet the hydrogen embrittlement test standards according to ASTM F 519-77. Ucspäad vatcennaitig så gat: as a complete freeze-resistant composition according to claim 12 with mineral ions below parameters that follow in parts by weight per million: Lead 0.05 Sodium 0.6 Potassium 0.06 Silica 0.03 Copper 0.09 Manganese 0.01 Iron 0.4 Phosphorus 0.6 14. Method for cleaning a compressor gas duct in a gas turbine and which includes parts with high-strength steel and thereby requires removal of organic and inorganic combustion residues, while the turbine is hot and out of operation, thereby injecting a pressurized flow of a composition according to claim 11 so that the parts in question are cleaned from the residues. The method of cleaning according to claim 14, wherein the drive position is at idle and the applied pressure is between 45 and 50 psi. A solid steel component, which has been cleaned of inorganic and organic combustion residues by applying a composition according to claim 11 or claim 12, and the component is of such a nature as to meet the standards of the hydrogen embrittlement potential test ANSI / ASTM F 519-77, wherein the cleaned component protective film residue, which remains on the corresponding surface as a result of the application of the composition and the component meets the standards according to the hydrogen embrittlement and disintegration test for at least 150 hours. A high-strength cleaned steel component according to claim 16, which relates to a gas turbine part. ”9 soz 650 18. Clean high-strength steel component according to kiaü ° 16) 'bch relating to a diesel engine part A cleaned high-strength steel component according to claim 16, which relates to a petrol engine part.