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Title: Corrosion of nickel-base alloys

Abstract

The volume consists of three tutorial lectures and 18 contributed papers. The three tutorial lectures provide state-of-the-art background on the physical metallurgy of nickel-base alloys as it relates to corrosion. Also featured are the mechanisms and applications of these alloys and an insight into the corrosion testing techniques. The three tutorial lecture papers will help acquaint newcomers to this family of alloys with a thorough overview. The contributed papers are categorized into four major topics: general corrosion, stress corrosion cracking, fatigue and localized corrosion. Each topic is key-noted by one invited lecture followed by several contributed papers. The papers in the general corrosion section are wide ranging and cover the aspects of material selection, development of galvanic series in corrosive environments, corrosion resistance characteristics, hydrogen permeation and hydrogen embrittlement of nickel and some nickel-base alloys.

Authors:
Publication Date:
OSTI Identifier:
7252826
Resource Type:
Book
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL; HYDROGEN EMBRITTLEMENT; NICKEL BASE ALLOYS; CORROSION; CORROSION FATIGUE; CORROSION RESISTANCE; CORROSIVE EFFECTS; CRACKS; FRACTURE MECHANICS; MATERIALS TESTING; PHYSICAL METALLURGY; ALLOYS; CHEMICAL REACTIONS; ELEMENTS; EMBRITTLEMENT; FATIGUE; MECHANICAL PROPERTIES; MECHANICS; METALLURGY; METALS; NICKEL ALLOYS; TESTING; TRANSITION ELEMENTS 360105* -- Metals & Alloys-- Corrosion & Erosion

Citation Formats

Scarberry, R.C. Corrosion of nickel-base alloys. United States: N. p., 1985. Web.
Scarberry, R.C. Corrosion of nickel-base alloys. United States.
Scarberry, R.C. 1985. "Corrosion of nickel-base alloys". United States. doi:.
@article{osti_7252826,
title = {Corrosion of nickel-base alloys},
author = {Scarberry, R.C.},
abstractNote = {The volume consists of three tutorial lectures and 18 contributed papers. The three tutorial lectures provide state-of-the-art background on the physical metallurgy of nickel-base alloys as it relates to corrosion. Also featured are the mechanisms and applications of these alloys and an insight into the corrosion testing techniques. The three tutorial lecture papers will help acquaint newcomers to this family of alloys with a thorough overview. The contributed papers are categorized into four major topics: general corrosion, stress corrosion cracking, fatigue and localized corrosion. Each topic is key-noted by one invited lecture followed by several contributed papers. The papers in the general corrosion section are wide ranging and cover the aspects of material selection, development of galvanic series in corrosive environments, corrosion resistance characteristics, hydrogen permeation and hydrogen embrittlement of nickel and some nickel-base alloys.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1985,
month = 1
}

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  • To understand the role of elemental sulfite in the stress corrosion cracking (SCC) of corrosion resistant alloys, researchers have tried various test techniques and methodologies with limited success. The authors feel they have developed a reliable test method for charging sulfite into Slow Strain Rate Test (SSRT) autoclaves. An effective SSRT method using a special cup-sulfur cell, has been described to evaluate the susceptibility to SCC in sulfur containing environments. The results obtained are reproducible and reliable. Using this test method, the effect of chloride concentration on the threshold temperature for SCC in sulfur containing sour brine has been initiallymore » evaluated. UNS N06950 was determined to have a higher temperature threshold compared with UNS N06255 and UNS N06985.« less
  • Nickel base alloys such as Alloy 625, C22, C276 and 59 are generally considered to have exceptional corrosion resistances in critical sea water applications at ambient temperature. Test results published in recent years however indicate that sever crevice corrosion of some of these alloys may occur under certain conditions. Exposure testes have been carried out in natural and chlorinated sea water on these alloys, together with two high N alloys, Alloy 24 and Alloy 654SMO. Electrochemical studies and simple mathematical mode.lling have also been carried out. These data, together with surface studies, help explain the observed phenomena and assist inmore » the safe selection of alloys for critical sea water applications.« less
  • Thermally treated (TT) Alloys 600 (16%Cr-8%Fe-bal.Ni) and 690 (30%Cr-10%Fe-bal.Ni) have been successfully used in the steam generators of operating pressurized water reactors (PWRs). This paper deals with intergranular stress corrosion cracking (IGSCC) mechanisms in Ni-base alloys in various corrosive environments such as deaerated water, air-saturated chloride medium, and caustic solutions at high temperatures with focus on Cr content and Cr carbide precipitation at grain boundaries in the alloys. Nickel base alloys of high purity, or with different Cr, C, and B contents with different heat treatments were put to various corrosion tests. SCC resistance of Alloy 600 is affected differentlymore » by water chemistry of environments, while Alloy 690 is almost immune to the environments investigated: (1) Cr depletion at grain boundaries is clearly detrimental to IGSCC resistance of Alloy 600 in air-saturated water containing Cl{sup {minus}} ions at 300 C. (2) High purity Alloy 600 has weaker SCC resistance in deaerated water at 360 C than commercially available Alloy 600. Cr depletion along grain boundaries is detrimental to the IGSCC resistance, however its detrimental effect disappears when Cr carbides precipitate at grain boundaries in semi-continuous or continuous way. The NiCr{sub 2}O{sub 4} film formed on the metal surfaces enhances the IGSCC resistance. Similar relationship between Cr depletion and Cr carbide precipitation is also observed in Alloy 600 in deaerated caustic solutions at high temperatures. (3) Concerning intergranular attack (IGA), which occurs in oxidizing caustic solutions at high temperature, existence of semi-continuous or continuous Cr carbides improves the IGA resistance regardless of Cr depletion. A dual layer corrosion protective film composed of an upper layer of NiO and lower layer of Cr{sub 2}O{sub 3} formed on metal surfaces, of which formation is accelerated by selective Cr carbide dissolution, may be responsible for the IGA resistance.« less
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