Additions to the helmet collection..
- Thread starter DarthJ
- Start date
very cool!!
Is that a Darth Stone Concept?
Is that a Darth Stone Concept?
defstartrooper
Sr Member
DarthJ
Sr Member
PM Sent..
Aaron-Wan-Kenobi
New Member
What is the hair made out of on the Leonidas helmet?
DarthJ
Sr Member
Horse..
Too Much Garlic
Master Member
Nice collection. Especially nice Concept Vader! :thumbsup
Though, never understood why the makers of that Leonidas lid add such kind of surface texture to what should essentially be a metal helmet. Simply doesn't make sense with dimples and scratches like that. Sorry for the OT.
Though, never understood why the makers of that Leonidas lid add such kind of surface texture to what should essentially be a metal helmet. Simply doesn't make sense with dimples and scratches like that. Sorry for the OT.
rmschneider104
Sr Member
Very cool Master Chief. Thanks for sharing.
Aaron-Wan-Kenobi
New Member
Do you have your own horse to shave or did you have to sneak into a stable and clip it under cover of darkness?:lol
All metal can pit, some more then others. A bronze helmet like this could have a very deep texture if it was rough to begin with and pitted.
Too Much Garlic
Master Member
Oh... okay... guess I need to learn more about metals before speaking. Thanks mate!
Def a cool collection! :thumbsup
I knew metal could pit, but I looked it up for more info: 
Sweet helmet BTW !
Pitting corrosion, or pitting, is a form of extremely localized corrosion that leads to the creation of small holes in the metal. The driving power for pitting corrosion is the lack of oxygen around a small area. This area becomes anodic while the area with excess of oxygen becomes cathodic, leading to very localized galvanic corrosion. The corrosion area tends to bury into the mass of the metal, with limited diffusion of ions, further pronouncing the localized lack of oxygen. The mechanism of pitting corrosion is probably the same as crevice corrosion.
The presence of chlorides, eg. in sea water, significantly aggravates the conditions for formation and growth of the pits through an autocatalytic process. The pits becomes loaded with positive metal ions through anodic dissociation. The Cl- ions become concentrated in the pits for charge neutrality and encourage the reaction of positive metal ions with water to form a hydroxide corrosion product and H+ ions. Now, the pits are weakly acidic, which accelerates the process.
Besides chlorides, other anions implicated in pitting include thiosulfates (S2O32–), fluorides and iodides. Stagnant water conditions favour pitting. Thiosulfates are particularly aggressive species and are formed by partial oxidation of pyrite, or partial reduction of sulfate. Thiosulfates are a concern for corrosion in many industries: sulfide ores processing, oil wells and pipelines transporting soured oils, Kraft paper production plants, photographic industry, methionine and lysine factories.
Bronze is an alloy of copper which can vary widely in its
composition. It is often used where a material harder than copper
is required, where strength and corrosion resistance is required
and for ornamental purposes. The variations in bronze (both in
proportion and elemental composition) can significantly effect its
weathering characteristics. "True" bronze is a combination of
approximately 90% copper (Cu) and 10% tin (Sn), however there are
three major classes or types of "bronzes" used in sculpture and
construction.
Traditionally, a copper alloy which contains zinc is a "brass"; a
copper alloy which contains tin (not exceeding 11%) is a "bronze".
Bronze composition may vary significantly however, and contemporary
bronzes are typically copper alloys which may contain silicon (Si),
manganese (Mn), aluminum (Al), zinc (Zn) and other elements, with
or without tin (Sn).
Bronze in its "raw" state is a "pinkish", salmon colored metal,
however it is rarely seen in its pure state. Bronze usually
exhibits some patination or corrosion so that its color normally
ranges from lime green to dark brown. Exposed bronze undergoes
continuous change and progresses through several predictable
"stages" of oxidation and corrosion. The stages of bronze
corrosion vary in duration and time of onset, based on many
factors, including:
1. composition of the bronze
2. patination or other protective treatments applied at the
foundry
3. weather
4. location and exposure
5. atmospheric pollutants
6. scheduled maintenance/cleaning, and
7. adjacent materials including residual core materials.
NATURAL OR INHERENT PROBLEMS
Bronze, like cast iron, is a manufactured product. Copper is
extracted from natural ores and alloyed with tin to create a metal
which does not exist in nature. Many of the inherent problems
relate to the normal physical process of the bronze "returning to
nature", i.e. to the most stable states of its components.
Additionally, most outdoor bronze is erected with a foundry applied
patina of some type. The actual surface patina could be one of
dozens of different composites as a result of the foundry applied
finishes. Each of these finishes may react differently with the
environment and result in different corrosion types and rates.
Regardless of which finish exists, the bronze will begin the
deterioration process described below, where the surface will be
subjected to the alteration of the patina through oxidation and
sulphurization. Patinated and protected surfaces will resist the
effects of exposure more than bare metal; therefore, such pieces
will maintain their original appearance longer and exhibit changes
more slowly.
CORROSION:
Corrosion of one form or another is the chief cause of the
deterioration of metals, including statuary and architectural
bronze. The degree of corrosion which occurs, and the corrosion
by-products which result, are affected by several factors including
bronze composition or formulation, environmental conditions and
adjacent materials.
While the composition of bronze does affect the rate of corrosion,
it has been generally recognized that composition is one of the
least significant factors in bronze deterioration. THE EXISTENCE
OF SULPHUR AND CHLORINE IN THE ATMOSPHERE, IN THE PRESENCE OF
MOISTURE, IS THE MOST SIGNIFICANT CAUSE OF BRONZE DETERIORATION.
Sweet helmet BTW !
Pitting corrosion, or pitting, is a form of extremely localized corrosion that leads to the creation of small holes in the metal. The driving power for pitting corrosion is the lack of oxygen around a small area. This area becomes anodic while the area with excess of oxygen becomes cathodic, leading to very localized galvanic corrosion. The corrosion area tends to bury into the mass of the metal, with limited diffusion of ions, further pronouncing the localized lack of oxygen. The mechanism of pitting corrosion is probably the same as crevice corrosion.
The presence of chlorides, eg. in sea water, significantly aggravates the conditions for formation and growth of the pits through an autocatalytic process. The pits becomes loaded with positive metal ions through anodic dissociation. The Cl- ions become concentrated in the pits for charge neutrality and encourage the reaction of positive metal ions with water to form a hydroxide corrosion product and H+ ions. Now, the pits are weakly acidic, which accelerates the process.
Besides chlorides, other anions implicated in pitting include thiosulfates (S2O32–), fluorides and iodides. Stagnant water conditions favour pitting. Thiosulfates are particularly aggressive species and are formed by partial oxidation of pyrite, or partial reduction of sulfate. Thiosulfates are a concern for corrosion in many industries: sulfide ores processing, oil wells and pipelines transporting soured oils, Kraft paper production plants, photographic industry, methionine and lysine factories.
Bronze is an alloy of copper which can vary widely in its
composition. It is often used where a material harder than copper
is required, where strength and corrosion resistance is required
and for ornamental purposes. The variations in bronze (both in
proportion and elemental composition) can significantly effect its
weathering characteristics. "True" bronze is a combination of
approximately 90% copper (Cu) and 10% tin (Sn), however there are
three major classes or types of "bronzes" used in sculpture and
construction.
Traditionally, a copper alloy which contains zinc is a "brass"; a
copper alloy which contains tin (not exceeding 11%) is a "bronze".
Bronze composition may vary significantly however, and contemporary
bronzes are typically copper alloys which may contain silicon (Si),
manganese (Mn), aluminum (Al), zinc (Zn) and other elements, with
or without tin (Sn).
Bronze in its "raw" state is a "pinkish", salmon colored metal,
however it is rarely seen in its pure state. Bronze usually
exhibits some patination or corrosion so that its color normally
ranges from lime green to dark brown. Exposed bronze undergoes
continuous change and progresses through several predictable
"stages" of oxidation and corrosion. The stages of bronze
corrosion vary in duration and time of onset, based on many
factors, including:
1. composition of the bronze
2. patination or other protective treatments applied at the
foundry
3. weather
4. location and exposure
5. atmospheric pollutants
6. scheduled maintenance/cleaning, and
7. adjacent materials including residual core materials.
NATURAL OR INHERENT PROBLEMS
Bronze, like cast iron, is a manufactured product. Copper is
extracted from natural ores and alloyed with tin to create a metal
which does not exist in nature. Many of the inherent problems
relate to the normal physical process of the bronze "returning to
nature", i.e. to the most stable states of its components.
Additionally, most outdoor bronze is erected with a foundry applied
patina of some type. The actual surface patina could be one of
dozens of different composites as a result of the foundry applied
finishes. Each of these finishes may react differently with the
environment and result in different corrosion types and rates.
Regardless of which finish exists, the bronze will begin the
deterioration process described below, where the surface will be
subjected to the alteration of the patina through oxidation and
sulphurization. Patinated and protected surfaces will resist the
effects of exposure more than bare metal; therefore, such pieces
will maintain their original appearance longer and exhibit changes
more slowly.
CORROSION:
Corrosion of one form or another is the chief cause of the
deterioration of metals, including statuary and architectural
bronze. The degree of corrosion which occurs, and the corrosion
by-products which result, are affected by several factors including
bronze composition or formulation, environmental conditions and
adjacent materials.
While the composition of bronze does affect the rate of corrosion,
it has been generally recognized that composition is one of the
least significant factors in bronze deterioration. THE EXISTENCE
OF SULPHUR AND CHLORINE IN THE ATMOSPHERE, IN THE PRESENCE OF
MOISTURE, IS THE MOST SIGNIFICANT CAUSE OF BRONZE DETERIORATION.
Last edited by a moderator:
Big_Water99
Well-Known Member
the leonidas and vader concept are Sweet :thumbsup
Very nice concept Vader!
