Evaluation of Lacquered Tinplate Corrosion in Canned Food through Characterization by using SEM &amp; EDS Technique

Sourajyoti Dey,Dr Mahesh Kumar Agraw

doi:10.14419/ijet.v7i4.5.20103

Abstract

Investigation of tinplate corrosion occurs in the interior of Cans containing food products due to electrochemical reactions. This changing the organoleptic properties of food stuff and produced toxicological problems. To investigate corrosion effect, lacquer adhesion failure of tinplate containers was evaluated with Scan Electron Microscope (SEM) along with Energy Dispersive X-ray spectroscopy (EDS) technique. This technique plays a vital role to investigate the reason of corrosion occurs in cans (container) like stress corrosion in the pack of fish and potatoes, pitting corrosion in the pack of light colored fruits and failure due to lacquer defects. Support of analytical methods may be also required to establish the failure.

Highlights

Tinplate is widely used for packaging and transportation of foods [1, 2] especially for food packing (Crnčević, 1980)
The results showed that the ferrous base exposed at the defects
The food grade lacquer was able to retard the corrosion of the tinplate but in experiment it was failed and corrosion occurred at lacquered surface of tinplate coated with 2.8/2.8 gm/m2 tin

Summary

Introduction

Tinplate is widely used for packaging and transportation of foods [1, 2] especially for food packing (Crnčević, 1980). Tinplate corrosion resistance plays an important role in the shelf-life of the canned product, its appearance and taste. In order to obtain adequate shelf-life of canned product, it is important to select the appropriate tinplate substrate for the food product. 25% of worldwide production of steel used to produce beverage tinplate cans [4]. Fabech (1998) recorded that, food producer are used lacquered cans for various category of foods, which including water, beverage, soft drinks, some alcohol drinks (beer and wine), fruit juices, nectars, tomato and tomato products [5] According to Kamm [6], corrosion evolution in tinplate is controlled by the continuity of the layers of free and alloyed tin (intermetallic), as well as by the behavior of exposed steel as detinning advances. A high porosity of the tin coating in tinplate has been related to high corrosion rates, and may shorten shelf-life [7]

Methods

Results

Discussion

Conclusion