The Effect Of Chromate On Stress Corrosion
Cracking Of Type 316 Austenitic Stainless Steel
In Hydrochloric Acid Solution And The
Transgranular SCC Mechanism
Author(s)
R. Nishimura & Y. Maeda
Abstract
The stress corrosion cracking (SCC) of a commercial austenitic stainless steel
type 316 was investigated as a function of applied stress, chromate concentration
and test temperature in 0.82 kmol/m3 HCl solution by using a constant load
method. The three parameters (lss; steady state elongation rate, tss; transition
time, tf; time to failure) obtained from the corrosion elongation curve were
divided into three regions against applied stress, which were dominated by stress,
SCC or corrosion. In the SCC-dominated region, log lss was a linear function of
log tf regardless of chromate concentration and test temperature, showing that lss
became a relevant parameter for prediction of tf. A critical chromate
concentration and a critical test temperature, above or below which little SCC
takes place, were estimated. The TGSCC mechanism was qualitatively proposed
to explain the results obtained.
Keywords: type 316, chromate, stress corrosion cracking, steady state
elongation rate, hydrochloric acid, corrosion elongation curve, TGSCC
mechanism.
1 Introduction
It is well known that chromate is a very good inhibitor as passivator for general
corrosion and localized corrosion. However, chromate is too toxic for human
beings to be used in public or in service at present. In this study, we used
chromate for estimating a corrosion behavior at crack tips for type 316
specimens under a constant applied stress condition, that is, acceleration of film
Keywords
type 316, chromate, stress corrosion cracking, steady state
elongation rate, hydrochloric acid, corrosion elongation curve, TGSCC
mechanism.
Related Book
Other papers in this volume
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