What type of corrosion leads to the deterioration and failure of braze welds?

• A. Alkali
• B. Galvanic
• C. Pitting
• D. Uniform

Answer: (A)

The correct interpretation for the type of corrosion that leads to the deterioration and failure of braze welds is specifically related to galvanic corrosion, not alkali corrosion.

Galvanic corrosion occurs when two dissimilar metals are in electrical contact in the presence of an electrolyte, causing one metal to corrode preferentially to the other. This is particularly relevant for braze welds, which typically involve the joining of different metals. When these metals are exposed to corrosive environments, the weaker metal (anodic) will corrode faster. This corrosion can weaken the braze weld joint, leading to failure.

Alkali corrosion usually refers to the corrosion process initiated by alkaline conditions but is not specific to braze welds. It does not directly relate to the type of materials used in brazing and their interactions in a corrosion environment.

Pitting corrosion is a localized form of corrosion that leads to small pits or holes, while uniform corrosion affects a surface evenly. These types do not specifically target the failure mechanisms of brazed joints caused by the galvanic action of dissimilar metals.

Therefore, the identification of galvanic corrosion as the main concern for braze weld integrity is crucial for understanding how to protect such joints from failure in practical applications