Synergistic Influence of the Addition of Al, Ni and Pb to a Zinc Bath upon Growth Kinetics and Structure of Coatings

Abstract

In this paper the current knowledge about the influence of alloy additions used in galvanizing baths has been analysed. The optimum concentration of Al, Ni and Pb addition has been established. Tests have been conducted to determine the synergistic influence of the addition of AlNiPb in a zinc bath upon the structure and growth kinetics of coatings. The structure and the chemical composition of coatings obtained on steel with low silicon contents and on Sandelin steel have been developed. It has been determined that the synergistic influence of the AlNiPb addition effectively lowers the reactivity of Sandelin steel and it improves zincs flowing off the product surface which results in decreased zinc consumption and better appearance of the coating. The structure of coatings obtained in a Zn-AlNiPb bath on Sandelin steel is similar to the structure of coatings obtained on low-silicon steel.

Structural Aspects of Decreasing the Corrosion Resistance of Zinc Coating Obtained in Baths with Al, Ni, and Pb Additives

“…Currently, these are multi-component zinc baths containing various alloying additives. Such additives are introduced to the zinc bath at the same time, which will result in [3,4]:…”

A Review of Recent Developments in Coating Systems for Hot-Dip Galvanized Steel

“…The anticipated galvanizing coating after zinc immersion can be realized when cooperating with a proper type of steel. In fact, the microstructure and mechanical property of prepared galvanized coatings would be significantly influenced by the chemical composition of matrix steel (Breval and Rachlitz, 1988;Lin, 1999;Vourlias et al, 2004;Vincent et al, 2006;Maaß et al, 2011;Schulz and Thiele, 2012;Kania and Liberski, 2014;Pokorny et al, 2016). The content of carbon and silicon in the matrix played a guiding role on the coating properties, meanwhile the component of manganese, phosphorus, and sulfur had relatively little impact on it.…”

Impact of Bi and Sn on Microstructure and Corrosion Resistance of Zinc Coatings Obtained in Zn-AlNi Bath

“…The above goal is achieved by appropriate selection of alloying additions for galvanizing baths. Nowadays, they are multi-component zinc baths including different alloying elements, which are added to the zinc bath simultaneously, the effect of which will give [ 8 , 9 ]: contraction of the bath surface oxidation intensity, restraining the impact of silicon content in steel on coating extension, developing the ability of liquid Zn to drip from a top surface of the product while being brought out from a bath.…”