US20170370823A1 - Innovative and safe method to conduct high temperature halogenation of metallic alloys - Google Patents
Innovative and safe method to conduct high temperature halogenation of metallic alloys Download PDFInfo
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- US20170370823A1 US20170370823A1 US15/436,117 US201715436117A US2017370823A1 US 20170370823 A1 US20170370823 A1 US 20170370823A1 US 201715436117 A US201715436117 A US 201715436117A US 2017370823 A1 US2017370823 A1 US 2017370823A1
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- 229910001092 metal group alloy Inorganic materials 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000026030 halogenation Effects 0.000 title claims abstract description 12
- 238000005658 halogenation reaction Methods 0.000 title claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 150000003839 salts Chemical class 0.000 claims abstract description 11
- 238000005260 corrosion Methods 0.000 claims abstract description 9
- 230000007797 corrosion Effects 0.000 claims abstract description 9
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 9
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000002775 capsule Substances 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 229910052736 halogen Inorganic materials 0.000 abstract description 21
- 150000002367 halogens Chemical class 0.000 abstract description 21
- 239000003708 ampul Substances 0.000 abstract description 12
- 238000012360 testing method Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 17
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 229910001507 metal halide Inorganic materials 0.000 description 3
- 150000005309 metal halides Chemical class 0.000 description 3
- 239000005049 silicon tetrachloride Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001493 electron microscopy Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005088 metallography Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000399 optical microscopy Methods 0.000 description 1
- 239000011833 salt mixture Substances 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 229910021422 solar-grade silicon Inorganic materials 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/03—Preparation from chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B9/00—General methods of preparing halides
- C01B9/02—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/08—Halides
- C01G53/09—Chlorides
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/04—Corrosion probes
- G01N17/043—Coupons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0052—Gaseous halogens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T436/00—Chemistry: analytical and immunological testing
- Y10T436/19—Halogen containing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T436/00—Chemistry: analytical and immunological testing
- Y10T436/25—Chemistry: analytical and immunological testing including sample preparation
- Y10T436/25875—Gaseous sample or with change of physical state
Definitions
- metal halides readily react with halogen gases at elevated temperatures to form metal halides. Some metal halides exhibit low melting points and some even sublime at relatively low temperatures. As a result, metallic alloys that form metal halides may suffer high-temperature corrosion. Industrial environments often contain halogen gases. Therefore, reactor vessels that are resistant to high temperature halogenation attack are often required.
- Hydrogen (H 2 ) and silicon-tetrachloride (SiCl 4 ) are used at temperatures between 950° to 1150° F. (or 510° to 621° C.) and at a relatively high pressure to produce solar grade silicon.
- the reaction between hydrogen and silicon-tetrachloride results in the formation of hydrochloric acid gas, HCl(g).
- the equilibrium between hydrogen gas and hydrochloric acid gas defines a partial pressure of chlorine gas (P Cl2 ) that can lead to high temperature chloridation attack on reactor vessel which is usually made of metallic alloys. Therefore, there is a need to determine the extent of halogenation of metallic alloys in an environment containing halogen gases.
- the present invention relates to a novel method and system for conducting high temperature corrosion tests on metallic alloys without the need for extensive laboratory equipment and attendant safety measures.
- the present invention comprises a two-compartment ampoule that provides a sealed environment for corrosion testing and using the halogen gas generated from a pre-selected salt mixture placed within the ampoule to simulate a halogen-containing environment a tested metallic alloy will be subject to.
- the present invention may be used for determining the corrosion rate of metallic alloys in halogen-containing environments.
- a method and system comprising a two-compartment sealed container (e.g., an ampoule) where a channel (e.g., a vestibule) connects these two compartments.
- a channel e.g., a vestibule
- a pre-selected mixture of salts e.g., mixture of nickel (Ni) and nickel chloride (NiCl 2 ) is placed in one compartment in order to generate a specific partial pressure of halogen gas (e.g., chlorine gas); and a metallic alloy is placed in the other compartment.
- the ampoule is then heated to a pre-determined temperature and held at this temperature for a pre-determined time period (e.g., 250 to 1,000 hours).
- a halogen gas e.g., chlorine gas
- a specific partial pressure is generated from said mixture of salts, flows through the vestibule and comes into contact with said metallic alloy.
- the amount of the mixture should be sufficient to generate sufficient halogen gas for the duration of the pre-determined time period. Because the ampoule creates a sealed environment, the metallic alloy is under constant halogenation during the pre-determined time period. Upon expiration of the pre-determined time period, the metallic alloy is removed from the ampoule and examined in order to determine the results of halogenation of the metallic alloy.
- FIG. 1 is a perspective view of a two-compartment ampoule where a vestibule connects these two compartments.
- FIG. 2 is a perspective view of a two-compartment ampoule where a pre-selected mixture of salts is placed in one compartment and a metallic alloy coupon is placed in the other compartment.
- the present invention involves exposing a metallic alloy to a halogen gas of a specific partial pressure at a pre-determined temperature over a pre-determined time period.
- Flowing gases can be used to set up the desired partial pressures in the atmosphere.
- these pose significant safety issues and require scrubbing systems.
- an innovative closed system was devised, thereby eliminating the necessity for an external, continuous flow system with its associated safety concerns.
- This innovation provided the necessary gaseous environment to which the metal or alloy was exposed while eliminating safety concerns.
- a sealed container 1 e.g., an ampoule, having two compartments ( 2 and 4 ) is disclosed.
- the sealed container 1 should be heat conductive.
- the sealed container 1 is purged with an inert gas, such as argon.
- the sealed container 1 is made of glass or quartz.
- a pre-selected mixture of salts 5 which is capable of generating a halogen gas at equilibrium, is placed in one compartment 2 .
- the pre-selected mixture 5 comprises an equi-molar mixture of nickel (Ni) and nickel chloride (NiCl 2 ), which at equilibrium generates chlorine gas of a specific partial pressure according to the following thermodynamic equilibrium:
- a metallic alloy element 6 is placed in the other compartment.
- the metallic alloy element 6 is a metallic alloy coupon.
- the sealed container 1 containing the mixture 5 and the metallic alloy element 6 is then heated to a pre-determined temperature (e.g., 626° C.) and held at this temperature for a pre-determined time period (e.g., 100, 250, 1,000 hours, etc.).
- a halogen gas e.g., chlorine gas
- the amount of the mixture should be sufficient to generate sufficient halogen gas for the duration of the pre-determined time period.
- the metallic alloy element 6 is constantly exposed to the halogen gas under the specific partial pressure during the entire pre-determined time period. Upon expiration of the pre-determined time period, the metallic alloy element 6 is then removed from the sealed container 1 and cleaned (e.g., by ultrasonic cleaning) in order to be examined and determine the results of halogenation (e.g., corrosion rate) of the metallic alloy element 6 .
- halogenation e.g., corrosion rate
- the metallic alloy element 6 may be analyzed in various ways including mass loss analysis and destructive metallography using optical and/or electron microscopy.
- the mass weight of metallic alloy element 6 is recorded before exposing to the halogen gas in the sealed container 1 .
- the mass weight of metallic alloy element 6 is again recorded after exposing to the halogen gas in the sealed container 1 and after being cleaned.
- the mass weight change of metallic alloy element 6 before and after exposing to the halogen gas is an indicator of the effect of halogenation on the tested metallic alloy.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Immunology (AREA)
- Inorganic Chemistry (AREA)
- Environmental Sciences (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Biodiversity & Conservation Biology (AREA)
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Abstract
Description
- This application claims the benefit of priority under 35 U.S.C. §119(e) to Provisional Application No. 62/297,519, filed on Feb. 19, 2016, which is incorporated by reference in its entirety.
- Not Applicable.
- Not Applicable.
- Not applicable.
- Many metals readily react with halogen gases at elevated temperatures to form metal halides. Some metal halides exhibit low melting points and some even sublime at relatively low temperatures. As a result, metallic alloys that form metal halides may suffer high-temperature corrosion. Industrial environments often contain halogen gases. Therefore, reactor vessels that are resistant to high temperature halogenation attack are often required.
- Hydrogen (H2) and silicon-tetrachloride (SiCl4) are used at temperatures between 950° to 1150° F. (or 510° to 621° C.) and at a relatively high pressure to produce solar grade silicon. The reaction between hydrogen and silicon-tetrachloride results in the formation of hydrochloric acid gas, HCl(g). The equilibrium between hydrogen gas and hydrochloric acid gas defines a partial pressure of chlorine gas (PCl2) that can lead to high temperature chloridation attack on reactor vessel which is usually made of metallic alloys. Therefore, there is a need to determine the extent of halogenation of metallic alloys in an environment containing halogen gases.
- Traditionally, metallurgical corrosion evaluation involves creating an accelerated simulated environment for corrosion testing using extensive laboratory equipment and constant monitoring to ensure safety. The present invention relates to a novel method and system for conducting high temperature corrosion tests on metallic alloys without the need for extensive laboratory equipment and attendant safety measures. The present invention comprises a two-compartment ampoule that provides a sealed environment for corrosion testing and using the halogen gas generated from a pre-selected salt mixture placed within the ampoule to simulate a halogen-containing environment a tested metallic alloy will be subject to. The present invention may be used for determining the corrosion rate of metallic alloys in halogen-containing environments.
- It is an objective of this invention to provide a method for testing metallic alloys in a halogen-containing environment with ease and reduced safety concerns.
- It is a further objective of this invention to provide a method that allows for long term exposure of metallic alloys in order to conduct testing of said metallic alloys in a halogen-containing environment.
- These and other objectives are preferably accomplished by providing a method and system comprising a two-compartment sealed container (e.g., an ampoule) where a channel (e.g., a vestibule) connects these two compartments. A pre-selected mixture of salts (e.g., mixture of nickel (Ni) and nickel chloride (NiCl2) is placed in one compartment in order to generate a specific partial pressure of halogen gas (e.g., chlorine gas); and a metallic alloy is placed in the other compartment. The ampoule is then heated to a pre-determined temperature and held at this temperature for a pre-determined time period (e.g., 250 to 1,000 hours). At the pre-determined temperature, a halogen gas (e.g., chlorine gas) of a specific partial pressure is generated from said mixture of salts, flows through the vestibule and comes into contact with said metallic alloy. The amount of the mixture should be sufficient to generate sufficient halogen gas for the duration of the pre-determined time period. Because the ampoule creates a sealed environment, the metallic alloy is under constant halogenation during the pre-determined time period. Upon expiration of the pre-determined time period, the metallic alloy is removed from the ampoule and examined in order to determine the results of halogenation of the metallic alloy.
- These and other aspects of this invention will become apparent to those skilled in the art after reviewing the following description of the invention.
- The above-mentioned features and objects of the present disclosure will become more apparent with reference to the following description taken in conjunction with the accompanying drawings and images wherein like reference numerals denote like elements and in which:
-
FIG. 1 is a perspective view of a two-compartment ampoule where a vestibule connects these two compartments. -
FIG. 2 is a perspective view of a two-compartment ampoule where a pre-selected mixture of salts is placed in one compartment and a metallic alloy coupon is placed in the other compartment. - For illustrative purposes, the principles of the present invention are described by referring to an exemplary embodiment thereof. Before any embodiment of the invention is explained in detail, it should be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it should be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.
- The present invention involves exposing a metallic alloy to a halogen gas of a specific partial pressure at a pre-determined temperature over a pre-determined time period. Flowing gases can be used to set up the desired partial pressures in the atmosphere. However, these pose significant safety issues and require scrubbing systems. In the present invention, an innovative closed system was devised, thereby eliminating the necessity for an external, continuous flow system with its associated safety concerns. This innovation provided the necessary gaseous environment to which the metal or alloy was exposed while eliminating safety concerns. In one embodiment, as shown in
FIG. 1 , a sealed container 1, e.g., an ampoule, having two compartments (2 and 4) is disclosed. These two compartments (2 and 4) are connected via a channel 3, e.g., a vestibule. Fluids (gases or liquid) may flow freely between these two compartments. The sealed container 1 should be heat conductive. Preferably, the sealed container 1 is purged with an inert gas, such as argon. In some embodiments, the sealed container 1 is made of glass or quartz. - In the present invention, as shown in
FIG. 2 , a pre-selected mixture of salts 5, which is capable of generating a halogen gas at equilibrium, is placed in one compartment 2. In one embodiment, the pre-selected mixture 5 comprises an equi-molar mixture of nickel (Ni) and nickel chloride (NiCl2), which at equilibrium generates chlorine gas of a specific partial pressure according to the following thermodynamic equilibrium: - A metallic alloy element 6 is placed in the other compartment. In one embodiment, the metallic alloy element 6 is a metallic alloy coupon. The sealed container 1 containing the mixture 5 and the metallic alloy element 6 is then heated to a pre-determined temperature (e.g., 626° C.) and held at this temperature for a pre-determined time period (e.g., 100, 250, 1,000 hours, etc.). At the pre-determined temperature, a halogen gas (e.g., chlorine gas) of a specific partial pressure is generated from the mixture 5, which flows through the channel 3 and filled the entire sealed container 1. The amount of the mixture should be sufficient to generate sufficient halogen gas for the duration of the pre-determined time period. Therefore, the metallic alloy element 6 is constantly exposed to the halogen gas under the specific partial pressure during the entire pre-determined time period. Upon expiration of the pre-determined time period, the metallic alloy element 6 is then removed from the sealed container 1 and cleaned (e.g., by ultrasonic cleaning) in order to be examined and determine the results of halogenation (e.g., corrosion rate) of the metallic alloy element 6.
- The metallic alloy element 6 may be analyzed in various ways including mass loss analysis and destructive metallography using optical and/or electron microscopy. In one embodiment, the mass weight of metallic alloy element 6 is recorded before exposing to the halogen gas in the sealed container 1. The mass weight of metallic alloy element 6 is again recorded after exposing to the halogen gas in the sealed container 1 and after being cleaned. The mass weight change of metallic alloy element 6 before and after exposing to the halogen gas is an indicator of the effect of halogenation on the tested metallic alloy.
- The previous description of the disclosed examples is provided to enable any person of ordinary skill in the art to make or use the disclosed methods and apparatus. Various modifications to these examples will be readily apparent to those skilled in the art, and the principles defined herein may be applied to other examples without departing from the spirit or scope of the disclosed method and apparatus. The described embodiments are to be considered in all respects only as illustrative and not restrictive and the scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed apparatus and methods. The steps of the method or algorithm may also be performed in an alternate order from those provided in the examples.
Claims (7)
Priority Applications (1)
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US15/436,117 US9869629B1 (en) | 2016-02-19 | 2017-02-17 | Innovative and safe method to conduct high temperature halogenation of metallic alloys |
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US201662297519P | 2016-02-19 | 2016-02-19 | |
US15/436,117 US9869629B1 (en) | 2016-02-19 | 2017-02-17 | Innovative and safe method to conduct high temperature halogenation of metallic alloys |
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US20170370823A1 true US20170370823A1 (en) | 2017-12-28 |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2956225A (en) * | 1957-09-25 | 1960-10-11 | Pure Oil Co | Corrosion testing apparatus |
US4019133A (en) * | 1975-12-29 | 1977-04-19 | Gulf Research & Development Company | Corrosion detecting and monitoring apparatus |
US20120103105A1 (en) * | 2010-10-28 | 2012-05-03 | Chevron U.S.A. Inc. | Testing device for stress corrosion cracking |
US20160041085A1 (en) * | 2013-03-12 | 2016-02-11 | Purafil, Inc. | Corrosion monitoring apparatus and methods |
-
2017
- 2017-02-17 US US15/436,117 patent/US9869629B1/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2956225A (en) * | 1957-09-25 | 1960-10-11 | Pure Oil Co | Corrosion testing apparatus |
US4019133A (en) * | 1975-12-29 | 1977-04-19 | Gulf Research & Development Company | Corrosion detecting and monitoring apparatus |
US20120103105A1 (en) * | 2010-10-28 | 2012-05-03 | Chevron U.S.A. Inc. | Testing device for stress corrosion cracking |
US20160041085A1 (en) * | 2013-03-12 | 2016-02-11 | Purafil, Inc. | Corrosion monitoring apparatus and methods |
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