Corrosion-Mechanical Fatigue: the Problems of Forecasting. Part 2. Reverse Effect. Influence of Stresses on the Corrosion Rate

Abstract

Corrosion is one of the main electrochemical processes that damage metal materials. The combination of cyclic stresses and a corrosive environment causes wear-fatigue damage, called corrosion-mechanical fatigue. The paper investigates the problem of predicting this type of wear-fatigue damage, which occurs in almost all branches of technology, especially in the chemical, oil, metallurgical industries, transport. The work consists of several parts. In the first part a technique for estimating the fatigue limit in a given corrosive environment (direct effect) is developed. The second part analyzes the reverse effect, i.e. the effect of acting stresses on the corrosion rate of metals and alloys, and proposes a method for predicting corrosion-erosion damage with the reverse effect based on the energy criterion. In the future, it is planned to discuss the mechanisms of corrosion-mechanical fatigue with direct and reverse effects at different stages of complex damage.

Keywords

• tribo-fatigue system
• stress corrosion rate
• fatigue limit
• corrosion-mechanical fatigue
• direct effect
• reverse effect
• cyclic stresses