J. Goellner

Using electrochemical noise to detect corrosion: Evaluation of a round-robin experiment

Abstract Successful measurement of electrochemical noise (EN) signals requires that a number of preconditions be fulfilled. In particular, fundamental understanding of the dynamics of the corrosion...

Magnesium Alloy in Contact with Coated Components

Abstract Investigations were carried out to study the galvanic corrosion of a magnesium alloy in contact with various coated components (e.g., fastening devices, threaded bushings, plugs, and screws). Such coated components are needed, for example, to assemble steering gear made out of pressure die-casted magnesium alloy. The quality of the coatings as well as their protective properties are of decisive importance in preventing galvanic corrosion. The determination of the coupling current density was the focal point of this research to evaluate galvanic corrosion. The difference between the rate of weight loss per unit area (vtot) calculated from the weight loss of the magnesium alloy MgAl9Zn1 (UNS M11910, AZ91) coupled to a coated component, and the rate of weight loss per unit area (vi) calculated from the coupling current density of a galvanic element was compared with natural corrosion data of MgAl9Zn1 without contact to a coated component under the same conditions. At high-contact corrosion rates, th...