A Method for Preventing Corrosion of Aluminum Cans After Cooking

Abstract

The invention relates to a corrosion protection method, in particular to a method for preventing corrosion of an aluminum can after cooking. The method for preventing corrosion of aluminum cans after cooking includes the following steps: before cooking aluminum cans, adding an acid resistant to high temperatures above 121°C and oxidation resistance to RO water used for cooking and sterilization of aluminum cans, and adjusting the pH of the RO water to 5.0 to 7.0, and control the conductivity of RO water below 50μs / cm; or before the aluminum cans are cooked, add corrosion and scale inhibitors whose corrosion inhibition rate increases with the increase of temperature to the RO water used for the cooking and sterilization of aluminum cans agent, the mass percentage of corrosion and scale inhibitor to RO water is greater than 0 and not greater than 2.5‰. In the present invention, the pH value of the RO water for cooking and sterilization is controlled to be 5.0 to 7.0, and the conductivity of the RO water is controlled below 50 μs / cm, or a corrosion and scale inhibitor is added to the RO water for cooking and sterilization of aluminum cans. Prevent the water quality of the retort from causing white spots on the aluminum cans after high-temperature cooking and sterilization.

Description

technical field [0001] The invention relates to a corrosion protection method, in particular to a method for preventing corrosion of an aluminum can after cooking. Background technique [0002] Aluminum two-piece cans are widely used due to their advantages of light weight, good airtightness, tasteless and non-toxic, easy to carry and recyclable, especially occupy a considerable proportion in beverage packaging containers. With the development of the economy and the improvement of people's living consumption level, beverage consumption is also increasing, and the demand for aluminum cans is also increasing year by year. [0003] Aluminum is an active amphoteric metal. Aluminum and its alloy products are easily oxidized and corroded during actual use, which seriously affects the related applications of aluminum and its products. The economic losses caused by the oxidation and corrosion of aluminum are huge every year. Over the years, people have studied various aluminum anti...

AI Technical Summary

Problems solved by technology

If there is a deviation in the process control during the can making and filling process, it is easy to form white spots on the bottom of the can after high-temperature cooking, which will affect the external appearance of the product

At present, the can factory can slow down the formation of white spots on the bottom of the tank during high-temperature cooking and sterilization to a certain extent by strictly controlling the canning process, but it cannot completely eliminate the appearance of white spots on the bottom of the tank. Therefore, it is very necessary to control the conditions of the high-temperature cooking and sterilization stage

Images