A method for protecting an aluminum pot from being corroded after cooking

Abstract

The invention relates to a corrosion preventing method, and particularly relates to a method for protecting an aluminum pot from being corroded after cooking. The method includes adding an acid havingresistance to oxidation and resisting a high temperature of 121 DEG C or above into RO water used for aluminum pot cooking sterilization before the aluminum pot is cooked to adjust the pH value of the RO water to be 5.0-7.0, and controlling specific conductivity of the RO water to be 50 [mu]s / cm or below; or adding a corrosion and scale inhibitor the corrosion inhibiting rate of which increases along with the increase of the temperature into the RO water before aluminum pot cooking sterilization, with the mass ratio of the corrosion and scale inhibitor to the RO water being greater than 0 andnot more than 0.25%. Through controlling the pH value of the RO water for cooking sterilization to be 5.0-7.0 and the specific conductivity of the RO water to be 50 [mu]s / cm or below, or through adding the corrosion and scale inhibitor into the RO water used for aluminum pot cooking sterilization, white spots on the aluminum pot after high-temperature cooking sterilization, which are caused by quality of water in a sterilization kettle, can be effectively prevented.

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

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