نورپردازی ویلا

?What is Bronze
Bronze is an alloy that contains copper (88%), tin (6%), zinc (2%), and lead (3%). It’s introduction over 5,000 years ago revolutionized metal work and launched the Bronze Age. By adding tim to copper, workers created a metal that was stronger and impervious to corrosion. Bronze artifacts have been found dating from as early as 3,500 BC

?How is Bronze different from Brass
Brass (specifically yellow brass) is also an alloy of copper, but differs from bronze in that its primary additive is zinc (40%). Brass is similar to bronze in hardness but suffers from the process of ‘dezincification’. This process that begins upon exposure to heat and humidity is the leaching of zinc from the metal. As the zinc migrates from the copper it leaves a porous structure susceptible to cracking and corrosion. As a result, brass lighting fixtures may eventually exhibit persistent red spots (zinc oxide) and become more brittle and crack as they age. (See link for more info on this topic.)

Brass is commonly used for landscape lighting fixtures because the melting temperature is lower than bronze making it easier to cast in an automated production. The high melting point of bronze necessitates casting in sand (a more difficult process) since the metal molds used in brass production would melt. A new sand mold is created for every individual CAST fixture

Understanding Corrosion
Corrosion of landscape lighting fixtures occurs through several mechanisms that are electrochemical in nature. In other words, chemicals react with the metals to produce an electric current. This current changes the structure and composition of the metal and results in pitting, flaking, chipping and cracking

The following chart illustrates how various metals found in lighting fixtures compare in their resistance to corrosion

Least Subject to Corrosion
Stainless Steel
Bronze
Copper
Brass
Cast Iron
Wrought Iron
Mild Steel
Aluminum
Most Subject to Corrosion

It should also be noted that while stainless steel is (in ideal conditions) more resistant to corrosion than bronze, it may be more susceptible at its edges, creases and at points where it contacts other metals

In an attempt to prevent corrosion, manufacturers use various coatings (e.g. powder-coat, paint and sealers) on the more susceptible metals. These coatings invariably fail to prevent corrosion since even microscopic gaps or inconsistencies in the coatings (or physical damage to the coatings) expose metal. This provides points of corrosion that can rapidly grow. The result is that the coatings are undermined, separating them from the surface leading to cracking and chipping

?Is Bronze more Beautiful

Moving from the scientific to the aesthetic, we can assess the superiority of bronze as a feature in the landscape. Bronze has a long history of use as the preferred material for outdoor sculpture, partly because of its durability but mainly because it weathers so beautifully

Once installed outdoors, the metallic bronze darkens to an old-penny brown then eventually to a greenish/blue patina. These colors compliment the browns and greens in nature and do not distract from the natural beauty of the landscape

Why Homeowners prefer Solid Bronze
CAST Landscape Lighting Designers will typically ask a homeowner to first hold a CAST solid bronze fixture and then a fixture from another manufacturer. The immediate impression is surprise at how the CAST fixture is so much heavier than the other. This translates into the (correct) impression of greater durability and value. Homeowners who are looking for both quality and value will always select CAST

In a market flooded with low quality fixtures out of Asia, designers who select solid bronze set themselves apart from their competitors and build reputations as professionals who will not compromise their high standards

source: cast-lighting

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