GENERAL CORROSION OF INCOLOY-800 IN SIMULATED SUPERHEAT REACTOR ENVIRONMENT

Black liquor high solids (about 80%) concentrators have often been found to suffer from aggressive corrosion. In particular, the first and second effect bodies are susceptible to corrosion attacks resulting in tube leaks and wall thinning, which limit the availability and lifetime of evaporator lines. Corrosion dynamics and construction materials have been studied extensively within the pulp and paper industry to understand the corrosion process. However, it has been challenging to identify root causes for corrosion, which has limited proactive measures to minimize corrosion damage. Corrosion of the first phase concentrator was studied by defining the potential regions for passive area, stress corrosion cracking, pitting corrosion, and general corrosion. This was achieved by using a technique called polarization scan that reveals ranges for the passive area in which the equipment is naturally protected against corrosion. The open circuit potential, also known as corrosion potential, and linear polarization resistance of the metal were monitored online, which allowed for definition of corrosion risks for stainless steel 304L and duplex stainless steels 2205 and SAF 2906. An online temperature measurement added insight to the analysis. A process diagnostics tool was used to identify root causes of the corrosion attacks. Many of the root causes were related to process conditions triggering corrosion. Once the metal surface was activated, it was difficult to repassivate the metal naturally unless a sufficient potential range was reached.

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The Effects of Carbonate-Bicarbonate Concentration on Empirical Corrosion Diagram of Mild Steel as a Material of Geological Disposal Package for High Level Nuclear Wastes

MRS Proceedings ◽

10.1557/proc-451-567 ◽

1996 ◽

Vol 451 ◽

Cited By ~ 1

Author(s):

Guen Nakayama ◽

Yuichi Fukaya ◽

Masatsune Akashi

Keyword(s):

Mild Steel ◽

Human Life ◽

General Corrosion ◽

Nuclear Wastes ◽

Bicarbonate Concentration ◽

Sulfate Ions ◽

Geological Disposal ◽

Groundwater Environment ◽

High Level ◽

Corrosion Diagram

ABSTRACTIn the scheme for geological disposal of high level radioactive nuclear wastes, the burial pit is to be isolated from the sphere of human life by a multiple-barrier system, which consists of an artificial barrier, composed of a canister, an overpack and a bentonite cushioning layer, and a natural barrier, which is essentially the bedrock. As the greatest as well as essentially the sole detriment to its integrity would be corrosion by groundwater. The groundwater comes to it seeping through the bentonite zone, thereby attaining conceivably the pH of transition from general corrosion to passivity, pHd, the behaviors of mild steel in such a groundwater environment have been examined. It has been shown that the pHd is lowered (enlargement of the passivity domain) with rising temperature and carbonate-bicarbonate concentration, while it is raised (enlargement of the general corrosion region) with increasing concentrations of chloride and sulfate ions.

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Kerusakan Pada Material Pipa Air Bersih Akibat General Corrosion

Jurnal Sains dan Teknologi Indonesia ◽

10.29122/jsti.v16i2.3409 ◽

2019 ◽

Vol 16 (2) ◽

Author(s):

M. N. Setia Nusa

Keyword(s):

Chemical Composition ◽

Failure Analysis ◽

External Surface ◽

Internal Surface ◽

General Corrosion ◽

Water Pipe ◽

Corrosion Attack ◽

Corrosion Failure ◽

Environment Factor

Water pipe of 4.5” diameter and has been operated for 8 year having failure due to corrosion attack on its external and internal surface. It is conducted failure analysis to find out the cause of corrosion by having testing examination of visual fractography, metalography,, SEM EDAX, hardness and chemical composition. Testing and examination results show that the failure / corroded pipe has a for in of general corrosion on the external surface due to environment factor or ground factor arround the pipe and on the internal surface was influenced by excessive root weld creating protrude which then causing turbolens and deposite to accelerate corrosion attack.Pipa berdiameter 4.5” yang berfungsi mengalirkan air bersih dan telah beroperasi selama 8 tahun, terjadi kerusakan berbentuk korosi pada permukaan luar pipa dan permukaan dalam. Untuk itu dilakukan analisa kerusakan untuk mengetahui penyebab terjadinya korosi dengan pengujian dan pemeriksaan secara visual,Fractography, Metallography, SEM, EDAX, Uji Kekerasan dan Uji Komposisi Kimia. Hasil pemeriksaan dan pengujian pada pipa yang rusak / korosi berbentuk jenis general korosi pada permukaan luar pipa yang diakibatkan faktor lingkungan atau tanah disekitar pipa, sedangkan pada bagian dalam pipa dipengaruhi oleh adanya lelehan pengelasan yang kurang sempurna sehingga menimbulkan benjolan yang mengakibatkan aliran air didalam pipa tidak lancar sehingga terjadi turbolensi yang menimbulkan endapan dan mengakibatkan percepatan terjadinya korosi.Keywords: Pipe, environtment, turbolens, corrosion, failure

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CARLSON ALLOY 90 10 CuNi

Alloy Digest ◽

10.31399/asm.ad.cu0600 ◽

1995 ◽

Vol 44 (5) ◽

Keyword(s):

Corrosion Resistance ◽

Physical Properties ◽

Tensile Properties ◽

Sea Water ◽

General Corrosion ◽

Good Resistance

Abstract 90-10 Cupro-nickel is a highly ductile, malleable and corrosion resisting alloy, suitable for water applications. The alloy has approximately 1.4% iron to improve its resistance to sea water. It has good resistance to general corrosion and erosion. Easily fabricated. Readily weldable. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance. Filing Code: CU-600. Producer or source: G.O. Carlson Inc.

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COPPER ALLOY No. C44400 and C44500

Alloy Digest ◽

10.31399/asm.ad.cu0599 ◽

1994 ◽

Vol 43 (11) ◽

Keyword(s):

Fracture Toughness ◽

Copper Alloy ◽

Heat Treating ◽

Small Addition ◽

Good Combination ◽

General Corrosion ◽

Good Resistance ◽

Tin Alloys ◽

Copper Zinc ◽

Strength And Ductility

Abstract COPPER ALLOY NOS. C44400 and C44500 are copper-zinc-tin alloys inhibited by antimony and phosphorus, respectively. They are commonly known as inhibited admiralty metal or admiralty brass. They have a good combination of strength and ductility and good resistance to general corrosion. The small addition of inhibitor is made to minimize the alloy’s susceptibility to dezincification and stress corrosion. They are used for condenser, evaporator and heat-exchanger tubes and associated applications. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: CU-599. Producer or source: Copper and copper alloy mills.

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AMPCOLOY 83

Alloy Digest ◽

10.31399/asm.ad.cu0310 ◽

1976 ◽

Vol 25 (3) ◽

Keyword(s):

Thermal Conductivity ◽

Corrosion Resistance ◽

Precipitation Hardening ◽

Base Alloy ◽

High Strength ◽

Heat Treating ◽

General Corrosion ◽

Copper Base ◽

Resistance To Wear ◽

Copper Base Alloy

Abstract AMPCOLOY 83 is a wrought copper-base alloy containing nominally 1.8% beryllium. It offers good formability in the unhardened condition and can be strengthened by precipitation hardening. It has a combination of high strength and hardness, good ductility, good electrical and thermal conductivity, excellent resistance to wear and fatigue, and high resistance to general corrosion. Among its many uses are components for resistance welding, bushings and shafts. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Cu-310. Producer or source: Ampco Metal Inc..

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AMBRALOY 928

Alloy Digest ◽

10.31399/asm.ad.cu0069 ◽

1958 ◽

Vol 7 (10) ◽

Keyword(s):

Corrosion Resistance ◽

Shear Strength ◽

Aluminum Alloy ◽

Physical Properties ◽

Tensile Properties ◽

High Strength ◽

General Corrosion ◽

Copper Aluminum

Abstract AMBRALOY-928 is a copper-aluminum alloy having high strength, hardness and excellent resistance to general corrosion. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, machining, and joining. Filing Code: Cu-69. Producer or source: American Brass Company.

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MUELLER ALLOY 1450

Alloy Digest ◽

10.31399/asm.ad.cu0389 ◽

1980 ◽

Vol 29 (2) ◽

Keyword(s):

Corrosion Resistance ◽

High Temperature ◽

Physical Properties ◽

Pure Copper ◽

Heat Treating ◽

High Conductivity ◽

General Corrosion ◽

Temperature Performance ◽

Screw Machine ◽

Machining Characteristics

Abstract MUELLER Alloy 1450 (formerly MBCo Alloy 799) is a high-conductivity copper containing sufficient small copper telluride particles to provide free-machining characteristics superior to those of any other high-conductivity copper. It has the same general corrosion resistance as copper. It is used widely for electrical or thermal conductors requiring extensive machining and for screw-machine products requiring a color that matches pure copper. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-389. Producer or source: Mueller Brass Company.

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