Galvanizing is the process of coating steel with zinc (Zn). The zinc is anodic with respect to steel; therefore, it will sacrifice to the steel in a corrosive environment. This means that the zinc will preferentially corrode and protect the steel, but this process is sacrificial. This protection will only last as long as Zn […]
Failure Analysis Laboratory: Exploding Champagne Bottle Failure
Background: The neck interior of all wine bottles is narrower at the very top than lower down in the bottle. The bottle interior is an inverted cone. So, due to cork expansion after bottling, the bottom of the cork is wider than the part at the top of the neck. This is how the cork […]
Bottle Sealing Failure Analysis to Find Cause of Bottle Leaking
Many products are packaged in glass bottles sealed by a cap with a pliable polymer liner. Some products such as jelly are sealed hot and this creates a vacuum seal. Other products such as soda and beer are sealed under pressure. Proper sealing requires that the bottle seal surface be smooth and not have a […]
Glass Oven Door Failure Analysis
A glass failure analysis was performed on a failed oven door made from heat strengthened glass. The glass in the door is connected to the handle with a metal clip placed directly onto the glass. The edges of the clip on the handle were not properly de-burred. Over time the normal use of the oven […]
Swimming Pool Tile Cracking: Glass v. Porcelain
There are two dominant modern tile types made for showers and swimming pools. These are glazed ceramic tiles and glass tiles. In these applications the tiles are exposed to thermal shock. Theoretically both tile types perform the same function. So it is important to understand the expected level of resistance to thermal shock for these […]
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