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Factors Involved in Corrosion of Tinned and Stainless Steel by Mild Acidic Solutions used in Cleaning Dairy Equipment

Whitemarsh Research Laboratories, Pennsylvania Salt Manufacturing Co., Wyndmoor, Pennsylvania

ABSTRACT

Mild acidic solutions are used or suggested for use in the dairy industry for a variety of cleaning operations, such as removal of milkstone deposits, cleaning of high-temperature short-time pasteurizers (7), in some can cleaning operations (6) and alternating with alkaline compounds for cleaning of equipment (1). The metals used most widely at the present time in manufacture of dairy equipment are tin-plated steel, prepared either by hot dip or electroplating methods, and 18-8 stainless steel. The usual feeling (1) is that organic acids are "mild" in their corrosive action on dairy equipment metals. Data on corrosion of tin plate or stainless steel by some of the acids and acid dairy cleaners used on dairy equipment are available (2, 3, 5, 6, 8). However, comparative data on some acids presently used in dairy cleaning seem to be lacking. Therefore, it was considered desirable to study factors involved in corrosion of tin plate and stainless steel by acidic materials in present use as dairy cleaners, near the temperature and concentration limits of dairy cleaning, with the hope of obtaining comparative data of possible practical value.