Abstract: A corrosion inhibitor for use in aqueous and liquid alcohol compositions is described comprising the combination of:(a) an alkylbenzoic acid or the alkali metal, ammonium, or amine salt thereof, said acid having the general formula ##STR1## where R is a C.sub.1 -C.sub.5 alkyl radical; (b) a C.sub.8 -C.sub.12 aliphatic monobasic acid or the alkali metal, ammonium, or amine salt thereof; and(c) a hydrocarbyl triazole.Aqueous compositions containing the above-described corrosion inhibitor as well as antifreeze/coolant concentrate and aqueous antifreeze/coolant compositions containing said corrosion inhibitor are also described. The corrosion-inhibitor of the instant invention gives synergistic corrosion protection to metal surfaces as compared with compositions containing either the alkylbenzoic or aliphatic monobasic acid component alone.

Abstract: A corrosion-inhibited antifreeze concentrate formulation containing no phosphate, amine, or nitrite compounds consists essentially of:(a) a major amount of a water soluble liquid alcohol freezing point depressant;(b) from 0.1-5.0 weight percent of a C.sub.6 -C.sub.12 aliphatic monobasic acid or the alkali metal salt thereof;(c) from 0.1-5.0 weight percent of an alkali metal borate compound; and(d) from 0.1-5.0 weight percent of a hydrocarbyl triazole.The concentrate formulation and aqueous antifreeze formulations of the instant invention give synergistic corrosion protection for a variety of metal surfaces as compared with compositions containing only the aliphatic monobasic acid/salt or alkali metal borate component alone.

Abstract: A corrosion inhibitor for use in water and liquid alcohol antifreeze/coolant compositions comprising the combination of a C.sub.5 -C.sub.16 aliphatic monobasic acid or the alkali metal, ammonium, or amine salt of said acid, a C.sub.5 -C.sub.16 hydrocarbyl dibasic acid or the alkali metal, ammonium, or amine salt of said acid, and a hydrocarbyl triazole gives synergistic corrosion protection to metal surfaces as compared with formulations containing either the monoacid or diacid component alone, or formulations containing other conventional corrosion inhibitors.

Abstract: Corrosion protection is provided to a metallic structure by a sacrificial anode system. A current control element is used to achieve fast and adequate corrosion protection under changing conditions, while excess current flow is minimized to extend anode life and avoid overprotection. The basic advantages of sacrificial anode systems such as simplicity and autonomy are retained. The system employs a field effect or a MOS (metal oxide silicon) semiconductor device to act as the current control element.

Abstract: A combined temperature control is an integral part of a corrosion probe. The probe includes a corrosion measuring element as one part thereof. The integral temperature control portion acts to provide a desired temperature at the measuring element. And, the result permits creation of the worst corrosive conditions at the measuring element of the probe, irrespective of the location of the probe in the corrosive environment.