Acidic oxidant-containing composition having aluminum corrosion-suppressing effect and use thereof

A method for preparing an acidic liquid composition, which is a disinfectant or a sterilizing agent for a subject containing, in part or in whole, aluminium or an aluminium alloy,

• the method comprising the step of:
• mixing (a) peracetic acid, or peracetic acid and hydrogen peroxide, as an acidic oxidant, (b) an alkali metal salt of nitric acid, and (c) at least one carboxylic acid selected from the group consisting of lactic acid, malic acid, succinic acid, and citric acid, or a salt thereof, such that the concentrations thereof are the following:
• the (a) acidic oxidant:
• in the case where the acidic oxidant is peracetic acid:
• 0.05 to 1 wt %;
• in the case where the acidic oxidant is the combination of peracetic acid and hydrogen peroxide:
• 0.05 to 1 wt % of peracetic acid and 0.05 to 2 wt % of hydrogen peroxide;
• the (b) alkali metal salt of nitric acid:
• 0.1 to 10 wt %;
• and
• the (c) carboxylic acid or the salt thereof:
• 0.1 to 30 wt %;
• and
• adjusting the pH to be in a range of from 2 to 6.

A disinfection or sterilization method comprising the step of:

• treating a subject including an aluminium-based metal as a member using an acidic liquid composition having a pH in a range of from 2 to 6,
• the acidic liquid composition containing:
• (a) peracetic acid, or peracetic acid and hydrogen peroxide, as an acidic oxidant, (b) an alkali metal salt of nitric acid, and (c) at least one carboxylic acid selected from the group consisting of lactic acid, malic acid, succinic acid, and citric acid, or a salt thereof, such that the concentrations thereof are the following:
• the (a) acidic oxidant:
• in the case where the acidic oxidant is peracetic acid:
• 0.05 to 1 wt %;
• in the case where the acidic oxidant is the combination of peracetic acid and hydrogen peroxide:
• 0.05 to 1 wt % of peracetic acid and 0.05 to 2 wt % of hydrogen peroxide;
• the (b) alkali metal salt of nitric acid:
• 0.1 to 10 wt %;
• and
• the (c) carboxylic acid or the salt thereof:
• 0.1 to 30 wt %.

A method for suppressing corrosiveness of an acidic oxidant on aluminium, wherein

• the (a) acidic oxidant consisting of peracetic acid, or peracetic acid and hydrogen peroxide is used in combination with (b) an alkali metal salt of nitric acid, and (c) at least one carboxylic acid selected from the group consisting of lactic acid, malic acid, succinic acid, and citric acid, or a salt thereof, such that the concentrations thereof are the following:
• the (a) acidic oxidant:
• in the case where the acidic oxidant is peracetic acid:
• 0.05 to 1 wt %;
• in the case where the acidic oxidant is the combination of peracetic acid and hydrogen peroxide:
• 0.05 to 1 wt % of peracetic acid and 0.05 to 2 wt % of hydrogen peroxide;
• the (b) alkali metal salt of nitric acid:
• 0.1 to 10 wt %;
• and
• the (c) carboxylic acid or the salt thereof:
• 0.1 to 30 wt %,
• in such a manner that the pH is adjusted to be in a range of from 2 to 6.