A hegesztési varratok termodinamikai sajátságai és korróziójának okai

Translated title of the contribution: The thermodynamics of welded seams and causes of its corrosion

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Because of the heating and cooling, energy changing takes palace in a welded seam. On the basis of the theoretical analysis of the energy changing, it can be stated that energy surplus is accumulated in a seam and this brings about its special character. Comparing of seam energy to the energy surplus of the amorphous or with other words glassy metals, an estimation of energy surplus has been made. Depending on the technology of welding and other circumstances it may vary from zero to about 6 kJ/mol. In corrosive environment the energy surplus in a seam results in an electrode potential difference between bulk metal and the seam. It may vary from 0 to about -30 mV, and for this reason the seam apt to corrosion. Behavior of alloys is similar to the pure metals. For the estimation of the corrosion behavior of an alloy it is very important the knowledge of corrosion characteristics of its less noble component. It must always be count on dealloying processes when the leaching of the less noble component takes place. In this case catalytically active surfaces may form. It has to be mentioned here that in stainless steel the Cr is a very nonnoble component and if the passivity is destroyed then can be counted on a fast leaching of Cr. Cleaning the welded seam with wire brush can cause even more corrosion danger, because the metal of brush may adsorb on the cleaned surface resulting in a multimetallic surface.

Original languageHungarian
Pages (from-to)76-86
Number of pages11
JournalKorrozios Figyelo
Volume48
Issue number4
Publication statusPublished - 2008

Fingerprint

Metals
Thermodynamics
Corrosion
Brushes
Leaching
Caustics
Stainless Steel
Cleaning
Welding
Stainless steel
Wire
Cooling
Heating
Electrodes

ASJC Scopus subject areas

  • Engineering(all)

Cite this

A hegesztési varratok termodinamikai sajátságai és korróziójának okai. / Szabó, S.; Bakos, I.

In: Korrozios Figyelo, Vol. 48, No. 4, 2008, p. 76-86.

Research output: Contribution to journalArticle

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