The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
Raul B. Rebak - One of the best experts on this subject based on the ideXlab platform.
-
Corrosion Behavior of Nickel Alloys in Wet Hydrofluoric Acid
2004Co-Authors: Raul B. RebakAbstract:Hydrofluoric Acid is a water solution of hydrogen fluoride (HF). Hydrofluoric Acid is used widely in diverse types of industrial applications; traditionally, it is used in pickling solutions in the metal industry, in the fabrication of chlorofluorocarbon compounds, as an alkylation agent for gasoline and as an etching agent in the industry of glass. In recent years, Hydrofluoric Acid has extensively been used in the manufacture of semiconductors and microelectronics during the wet chemical cleaning of silicon wafers. Hydrofluoric Acid can be considered a reducing Acid and although it is chemically classified as weaker than, for example, sulfuric or hydrochloric Acids, it is extremely corrosive. This Acid is also particularly toxic and poses greater health hazard than most other Acids. The corrosion behavior of metals in Hydrofluoric Acid has not been as systematic studied in the laboratory as for other common inorganic Acids. This is largely because tests using Hydrofluoric Acid cannot be run in standard equipment and because of the toxic nature of this Acid. Moreover, short-term weight loss laboratory corrosion tests in Hydrofluoric Acid can be frustrating since the results are not as highly reproducible as in the case of other Acids such as sulfuric or hydrochloric. One of the reasons is because Hydrofluoric Acid commonly attacks the coupons used for testing in a non-uniform manner. That is, the corrosive power of this Acid is not aimed to uniform thinning but mostly to localized penetration below the skin of the metal in the form of thin cracks, voids, pits, trenches and sometimes intergranular attack. Figure 1 shows the cross section of a coupon of Alloy 600 (N06600) exposed for 336 h to the vapor phase of a solution of 20% HF at 93 C. In cases where internal penetration occurs such as in Figure 1, it may not be recommended to use corrosion rates based on weight loss for material selection.
-
Corrosion Behavior of Nickel Alloys in Wet Hydrofluoric Acid
Materials and Corrosion-werkstoffe Und Korrosion, 2001Co-Authors: Raul B. Rebak, Jeffrey R. Dillman, Paul Crook, C. V. V. ShawberAbstract:Hydrofluoric Acid is a water solution of hydrogen fluoride (HF). Hydrofluoric Acid is used widely in diverse types of industrial applications; traditionally, it is used in pickling solutions in the metal industry, in the fabrication of chlorofluorocarbon compounds, as an alkylation agent for gasoline and as an etching agent in the industry of glass. In recent years, Hydrofluoric Acid has extensively been used in the manufacture of semiconductors and microelectronics during the wet chemical cleaning of silicon wafers. Hydrofluoric Acid can be considered a reducing Acid and although it is chemically classified as weaker than, for example, sulfuric or hydrochloric Acids, it is extremely corrosive. This Acid is also particularly toxic and poses greater health hazard than most other Acids. The corrosion behavior of metals in Hydrofluoric Acid has not been as systematic studied in the laboratory as for other common inorganic Acids. This is largely because tests using Hydrofluoric Acid cannot be run in standard equipment and because of the toxic nature of this Acid. Moreover, short-term weight loss laboratory corrosion tests in Hydrofluoric Acid can be frustrating since the results are not as highly reproducible as in the case of other Acids such as sulfuric or hydrochloric. Onemore » of the reasons is because Hydrofluoric Acid commonly attacks the coupons used for testing in a non-uniform manner. That is, the corrosive power of this Acid is not aimed to uniform thinning but mostly to localized penetration below the skin of the metal in the form of thin cracks, voids, pits, trenches and sometimes intergranular attack. Figure 1 shows the cross section of a coupon of Alloy 600 (N06600) exposed for 336 h to the vapor phase of a solution of 20% HF at 93 C. In cases where internal penetration occurs such as in Figure 1, it may not be recommended to use corrosion rates based on weight loss for material selection.« less
Liang Ping - One of the best experts on this subject based on the ideXlab platform.
-
Corrosion Resistance of Electroless Ni-P Coating in Hydrofluoric Acid
Electroplating & Pollution Control, 2013Co-Authors: Liang PingAbstract:In order to improve the corrosion resistance of Q 235 steel in Hydrofluoric Acid,a Ni-P coating was prepared on its surface by electroless plating.The surface morphology of the coating was observed using metalloscope,and the corrosion behavior of Q 235 steel and Ni-P coating was investigated by immersion and electrochemical method.The results show that the Ni-P coating is smooth and dense,and exhibits a lower self-corrosion current density and a higher charge-transfer resistance in Hydrofluoric Acid,that can obviously decrease the corrosion rate of Q 235 steel in Hydrofluoric Acid.
-
Corrosion Resistance of Ni-Cu-P Coating in Hydrofluoric Acid Solution
Journal of Petrochemical Universities, 2011Co-Authors: Liu Wen-tao, Liang Ping, Sinopec BeijingAbstract:Ni-Cu-P ternary alloy plating was made by electroless plating technology in the surface of 20R steel for improving corrosion resistance of 20R steel in Hydrofluoric Acid.The surface morphology and structure of the coating were observed and tested through metallography and X-ray diffraction technique.The corrosion behavior of 20R steel and the coating was tested by immersion method and electrochemical system in Hydrofluoric Acid solution.The results show that:Ni-Cu -P coating can deposit smoothly in the surface of 20R steel.The coating is smooth,compact and crack free and has prevented 20R steel from contacting Hydrofluoric Acid directly.The coating is much easier to passivate in Hydrofluoric Acid solution.Thus,the coating has corrosion resistance to some extent.
Wengfu Lantian - One of the best experts on this subject based on the ideXlab platform.
-
Corrosion Behaviors of 904LAustenite Stainless Steel in Concentrated Sulfuric Acid Containing Hydrofluoric Acid
2013Co-Authors: Zeng Hongtao, Wengfu LantianAbstract:Potentiodynamic polarization curves, cyclic polarization curves and electrochemical impedance spectroscopy (EIS) were used to investigate the corrosion behaviors of 904L stainless steel in concentrated sulfuric Acid containing Hydrofluoric Acid. The result shows that the corrosion of 904L stainless steel in concentrated sulfuric Acid is inhibited when the mass fraction of Hydrofluoric Acid is less than 2% ; while the corrosion is promoted when the mass fraction of Hydrofluoric Acid is higher than 2% . With the increase of Hydrofluoric Acid concentration, the corrosion controlling step changes from electrochemical reaction to mixed mass transportation- electrochemical reaction. EIS and the plots present the change of time contant from one to two, i.e.
C. V. V. Shawber - One of the best experts on this subject based on the ideXlab platform.
-
Corrosion Behavior of Nickel Alloys in Wet Hydrofluoric Acid
Materials and Corrosion-werkstoffe Und Korrosion, 2001Co-Authors: Raul B. Rebak, Jeffrey R. Dillman, Paul Crook, C. V. V. ShawberAbstract:Hydrofluoric Acid is a water solution of hydrogen fluoride (HF). Hydrofluoric Acid is used widely in diverse types of industrial applications; traditionally, it is used in pickling solutions in the metal industry, in the fabrication of chlorofluorocarbon compounds, as an alkylation agent for gasoline and as an etching agent in the industry of glass. In recent years, Hydrofluoric Acid has extensively been used in the manufacture of semiconductors and microelectronics during the wet chemical cleaning of silicon wafers. Hydrofluoric Acid can be considered a reducing Acid and although it is chemically classified as weaker than, for example, sulfuric or hydrochloric Acids, it is extremely corrosive. This Acid is also particularly toxic and poses greater health hazard than most other Acids. The corrosion behavior of metals in Hydrofluoric Acid has not been as systematic studied in the laboratory as for other common inorganic Acids. This is largely because tests using Hydrofluoric Acid cannot be run in standard equipment and because of the toxic nature of this Acid. Moreover, short-term weight loss laboratory corrosion tests in Hydrofluoric Acid can be frustrating since the results are not as highly reproducible as in the case of other Acids such as sulfuric or hydrochloric. Onemore » of the reasons is because Hydrofluoric Acid commonly attacks the coupons used for testing in a non-uniform manner. That is, the corrosive power of this Acid is not aimed to uniform thinning but mostly to localized penetration below the skin of the metal in the form of thin cracks, voids, pits, trenches and sometimes intergranular attack. Figure 1 shows the cross section of a coupon of Alloy 600 (N06600) exposed for 336 h to the vapor phase of a solution of 20% HF at 93 C. In cases where internal penetration occurs such as in Figure 1, it may not be recommended to use corrosion rates based on weight loss for material selection.« less
John A Henry - One of the best experts on this subject based on the ideXlab platform.
-
intravenous regional calcium gluconate perfusion for Hydrofluoric Acid burns
Clinical Toxicology, 1992Co-Authors: John A HenryAbstract:AbstractWe report a case in which acute digital Hydrofluoric Acid burns were treated with regional intravenous perfusion of calcium gluconate to relieve pain and protect from further tissue damage. This is the first documented instance of this technique being used. The conventional treatments for digital Hydrofluoric Acid burns all have their shortcomings; intravenous regional perfusion of calcium gluconate may be an effective method of treatment for digital Hydrofluoric Acid burns.
