Can You Use Stainless Steel Screws in Aluminum?
Stainless steel screws can be used in aluminum. The difference in their metallic makeup can result in difficulties under certain situations involving heat, friction or exposure to water. Despite their drawbacks, stainless steel screws are preferred over their aluminum counterparts because they are harder and more durable. Does this Spark an idea?
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Galling Damage
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Galling refers to damage to the surface layer of the metal or metal alloy and is caused by the aluminum and stainless steel screws being subjected to friction and heat during the application of the screws. Galling causes splitting in the aluminum and a roughening of the surface. Though the effect of the galling may be hard to see at the initial point of friction, the splitting can result in long-term structural damage.
Galvanic Corrosion
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Galvanic corrosion is primarily a concern with substances used in marine applications, but can occur on land if the material is routinely exposed to water. The introduction of water to the two metals touching one another serves as an electrolyte, which results in an electrochemical corrosion process. The aluminum then begins to corrode, leading to damage and eventual need for replacement.
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Preventative Tools
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Fasteners plated in materials, such as cadmium, are used to prevent galling and galvanic corrosion. Coating the stainless steel screws in other materials, such as Teflon or having the screws anodized, is another preventative measure. To prevent galling specifically, apply a lubricant to reduce the friction caused by the screws.
Keeping Materials Dry
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For galvanic corrosion, the best preventative measure is keeping the metals dry. Primers and sealants serve as additional tools to keep the metals from getting wet. If keeping the metals dry is not an option, it is better to use aluminum screws instead of stainless steel.
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