Closure to “Discussion of ‘Corrosion of Heating Electrodes in Molten Chlorides Baths’ [H. R. Copson (pp. 257–264)]”

Copson, H. R.

doi:10.1149/1.2781070

Cited by 7 publications

(10 citation statements)

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“…With regard to the incorporation of 0.5 wt% Cr (steel C7) to the initial steel used in this research (C1), a certain improvement in corrosion resistance is seen in both marine atmospheres (Figure b), confirming the results obtained by Copson and Larrabee and Coburn, who reported that Cr additions of less than 0.6 wt% in mild steel with the presence of at least 0.1 wt% Cu led to a significant improvement in atmospheric corrosion resistance. Larrabee and Coburn found that Cr additions of 0.6–1.3 wt% could be detrimental, especially in industrial atmospheres.…”

Section: Discussionsupporting

confidence: 88%

“…There are two approaches to the development of advanced WS for application in marine atmospheres by increasing Cr or Ni contents. Cr is well known to have a beneficial effect on the behaviour of steels exposed to marine atmospheres . Zhang et al, in the marine atmosphere of Qingdao in China, observed an important improvement of Cu (0.30 wt%)‐Cr (1.53 wt%) WS in comparison to CS.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cu, Cr and Ni alloying elements on mechanical properties and atmospheric corrosion resistance of weathering steels in marine atmospheres of different aggressivities

Cano¹,

Díaz²,

Fuente³

et al. 2017

Materials & Corrosion

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This paper studies the individual and combined effect of adding Cu (0.26-1.06 wt%), Cr (0.54 wt%) and Ni (0.92-2.92 wt%) alloying elements to carbon steel with regard to mechanical behaviour and atmospheric corrosion resistance in two marine atmospheres with different chloride deposition rates (20 and 71 mg ClMechanical properties are assessed in terms of yield strength, ultimate strength, elongation, hardness and weldability, while atmospheric corrosion resistance is evaluated by determination of corrosion losses, rust layer structure, and nature of the corrosion products formed. The best atmospheric corrosion resistance is obtained with weathering steel (3 wt% Ni), which would be suitable for use unpainted in marine atmospheres of moderate salinity (≤20 mg Cl − /m 2 · d), though a longer cooling time would be required during its manufacture in order to assure adequate weldability. K E Y W O R D Satmospheric corrosion, Cr, Cu, marine atmospheres, mechanical properties, Ni, weathering steels

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Effect of Cu, Cr and Ni alloying elements on mechanical properties and atmospheric corrosion resistance of weathering steels in marine atmospheres of different aggressivities

Cano¹,

Díaz²,

Fuente³

et al. 2017

Materials & Corrosion

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“…According to the well-known Copson diagram nickel base alloys are considered to be immune to chlorideinduced SCC [22] but as shown above not to pitting corrosion.…”

Section: Chloride-induced Sccmentioning

confidence: 99%

Corrosion resistance of SG tubing material Incoloy 800 mod. and Inconel 690 TT

Kilian

Wieling

Stieding

1991

Materials & Corrosion

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The corrosion resistance of the SG tubing material Incoloy 800 mod. and Inconel 690 TT is considered with respect to pitting, sensitization characteristics and stress corrosion cracking, especially chloride‐induced cracking, pure water cracking and caustic cracking. Based on laboratory data Incoloy 800 mod. as well as Inconel 690 TT show very good corrosion resistance under specified and faulted SG water conditions. The published results often refer to Incoloy 800 according to ASTM B 163–66. It is shown that the Incoloy 800 grade used by nuclear power suppliers is optimized for this application. The restricted chemical composition of the modified grade of Incoloy 800 vs. the standard grade is discussed and it is shown that this results in a significantly higher resistance to the above mentioned corrosion phenomena. The operating experience with Incoloy 800 mod. heat transfer tubes in nuclear steam generators is discussed briefly with respect to corrosion. No materrial‐specific weaknesses have been observed with Incoloy 800 mod. Since more than 19 years of operation only at one tube out of 235 000 SG tubes made of Incoloy 800 mod. a leakage caused by corrosion has been occurred. This finding is independent of different tube manufacturers and different water treatments of the various plants.

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“…Copson (46) discussed the influence of corrosion on the cracking of pressure vessels and mentioned that serious damage can occur when stress and corrosion combine, taking the form of stress corrosion cracking, involving static tensile stresses, or corrosion fatigue involving cyclic stresses. The effects of corrosion on pressure vessels may be minimized by design, by reduction of internal or applied stresses, and by choice of materials suitably resistant to their expected service environment.…”

Section: High Temperature Propertiesmentioning

confidence: 99%