Corrosion testing is needed to qualify all packaging materials and all packaging types in order to avoid unwanted corrosion surprises in the market. area. Both the crimp and the double seam crevices could have steel, tin and coating general corrosion; valve and/or container top metal pitting corrosion; and coating corrosion in the form of blistering or small delaminated patches—when there is an internal coating in the steel container. Finally, dip tube swelling could also produce crevice corrosion in steel aerosol containers. The types of corrosion at the two interfaces are the same as those for aluminum aerosol containers. The types of corrosion in the liquid product area are also the same as those for aluminum aerosol containers. Weld corrosion could be steel, tin and coating general corrosion; pitting corrosion of the container steel and side seam stripe coating corrosion as blistering or small delaminated patches—when there is a coating stripe on the weld. Three-piece steel containers also have bottom double seam crevice could also have steel, tin and coating general corrosion; metal pitting corrosion and coating corrosion in the form of blistering or small delaminated patches—when there is an internal coating in the steel container. Numerous products are successfully marketed in spray packaging in spite of the spray package corrosion complexity. Several options are available that aid in controlling and preventing spray package corrosion: • Different types of container metals are available if the first metal selection proves to be susceptible to corrosion—no one type of package metal is corrosion proof • Different types of internal container coatings are available—no one type of coating is corrosion proof • Corrosion inhibitors allow the packaging of many formulas in most if not all types of spray packages—there is no one-size-fits- all corrosion inhibitor • Internal bags for traditional aerosol containers • Implementing narrow specifications on raw materials and raw material concentrations Corrosion testing is needed to qualify all packaging materials and all packaging types in order to avoid unwanted corrosion surprises in the market. Corrosion testing is also needed when switching package materials and types of packages. Pair O Docs has a state-of-the art electrochemical corrosion testing laboratory; please contact me if you would like to know more about our faster and predictive corrosion testing. You can also visit our new website which has a short Vision Video that discusses all our corrosion prevention and control services. Please also contact me if you would like to a have our Elements of Spray Package Corrosion short course taught at your R&D facility. Thank you and I’ll see you in July. Spray June 2017 Spray 29 Figure 2. Inside a three-piece welded tinplated steel aerosol container
Spray June 2017
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