The effect of saltwater on the gold treasures of sunken ships is an exciting story that combines myths with harsh scientific reality.

In short: gold itself is almost unaffected by saltwater, but everything around it is destroyed fundamentally.

Let's delve into this in more detail.

1. Gold: "The King" is not afraid of water

Gold is a noble metal. This is a scientific term that means it is extremely inert and does not react with most chemical elements.

• Salt resistance: Chloride sodium (salt) and dissolved oxygen in water do not have any corrosive effect on gold. Nothing happens to it that we call "rust" or "oxidation".

• Appearance: A gold coin or ingot that has been lying at the bottom of the ocean for 300 years will look almost the same as on the day of the shipwreck. It is enough to rinse them with fresh water, and they will shine with their original brilliance. This is why gold has been and remains a symbol of eternal value.

2. What about the "treasures"? Main threats

The problem is not with gold, but with its "neighbors" and storage conditions.

Threat #1: Electrolytic corrosion (Galvanic couple)

This is the biggest and most interesting problem. When different metals are in contact in an electrolyte (and seawater is an excellent electrolyte), an electric current is generated between them.

• How it works: More "active" metal (anode) begins to degrade, sacrificing itself for the protection of the more "noble" metal (cathode).

• Example: If a gold coin was lying in an iron chest or next to silver coins and copper cannons, a galvanic couple is formed. Iron and copper will actively corrode, while gold will remain intact. However, the result will be that gold objects can literally "weld" to their neighbors with a spattered layer of rust and minerals. Their extraction becomes a complex archaeological task.

Threat #2: Formation of concretions

This is a natural "sarcophagus" that forms around objects on the seabed.

• Process: Soluble salts in water (especially calcium carbonate) and metal oxides (from corroding iron) gradually settle on any solid surfaces. Over time, they fuse into a monolithic, stone block — a concretion.

• Result: Gold coins and jewelry can be permanently encased within such a multi-ton block. To reach the treasure, it is necessary to carefully break this conglomerate.

Threat #3: Mechanical impact and biological factors

• Currents and sand: Constant movement of water and the abrasive action of sand can physically abrade and damage delicate items (such as gold chains), although they do not destroy the metal itself.

• It is here that the consequences are most catastrophic:

  • Silver: Darkens and is subject to chloride corrosion, covered with a thick layer of black or purple silver chloride. Coins often fuse into monolithic blocks.

  • Iron and steel: (Cannons, anchors, hull of the ship). They are almost completely destroyed, leaving behind only "shadows" of rust and concretions that resemble their shape.

  • Precious stones: (Emeralds, rubies, diamonds). They are generally chemically stable, but organic materials such as pearls and corals are completely destroyed.

  Conclusion in the form of a table:

  Object	Effect of saltwater	Condition after centuries at the bottom
  Gold coins, ingots	Practically absent	As new, after rinsing. May be encased in concretions.
  Gold jewelry (with stones)	Gold is intact, but fastenings may be damaged by corrosion of other metals.	Intact, but may crumble when handled carelessly.
  Silver coins	Severe corrosion, formation of silver chloride.	Darkened, fused into monolithic blocks.
  Iron cannons, anchors	Complete destruction.	Disappear, leaving behind hollows in concretions ("rusty specters").

  Conclusion: The legends of treasure chests filled with shimmering gold that are opened at the bottom of the sea are a myth. The reality is that gold really survives centuries in almost perfect condition, but its "extraction to the light" is a colossal task for archaeologists and restorers who spend years battling the consequences of electrolytic corrosion and concretions to free the immortal metal from its stone prison.

  
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  How does saltwater affect the gold treasures of sunken ships in the seas? // New-York: Libmonster (LIBMONSTER.COM). Updated: 23.11.2025. URL: https://libmonster.com/m/articles/view/How-does-saltwater-affect-the-gold-treasures-of-sunken-ships-in-the-seas (date of access: 12.12.2025).
  
  

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