Water-based coolant

Abstract

A water-based coolant contains: at least one inorganic acid salt selected from among carbonate, hydrogen carbonate, sesquicarbonate, phosphate, borate, molybdate and tungstate; and a metal corrosion inhibitor. The water-based coolant is excellent in cooling performance and unlikely to cause corrosion of a metal material to be cooled. Therefore, the water-based coolant is suitably usable as a quenchant or a cutting oil.

Description

TECHNICAL FIELD[0001]The present invention relates to a water-based coolant and, in particular, to a water-based coolant usable, for instance, for quenching a metal component.BACKGROUND ART[0002]Coolants (quenchants) usable for, for instance, quenching metal components are mainly categorized into an oil-based quenchant and a water-based quenchant (an aqueous solution), the oil-based quenchant being frequently used. Using the oil-based quenchant, which exhibits an appropriate cooling performance, results in a reduced quenching distortion and thus in avoidance of quenching cracks.[0003]However, in quenching a particularly large metal component or a metal component with poor hardenability using the oil-based quenchant, the cooling speed is slow and the cooling performance is insufficient. Accordingly, the water-based quenchant is used. However, in the case of using the water-based quenchant, the cooling performance of which is higher than that of the oil-based quenchant, uneven cooling...

AI Technical Summary

Benefits of technology

The technical effect of this patent is to create a water-based coolant that is great at cooling and is less likely to cause damage to metal materials.

Problems solved by technology

However, in quenching a particularly large metal component or a metal component with poor hardenability using the oil-based quenchant, the cooling speed is slow and the cooling performance is insufficient.

However, in the case of using the water-based quenchant, the cooling performance of which is higher than that of the oil-based quenchant, uneven cooling is likely to occur and thus quenching cracks may be caused.

However, when the saline solution is used as a quenchant, rust forms in quite a short time of one hour or less after the start of a quenching treatment, resulting in severe corrosion of equipment such as an oil bath.