Titanium zinc and corrosion

Titanium zinc is used to protect metallic components against corrosion in the long term. Nevertheless, the processing is not without problems. In particular, around the house and in house construction is to pay attention to many factors that can cause corrosion on titanium zinc.

Many uses for titanium-galvanized metals

Titanium zinc is used to galvanize metallic workpieces and sheets to protect it against corrosion in the long term. Nevertheless, the titanium zinc can also pose a considerable risk of corrosion. Especially during construction or renovation and refurbishment work around the house, contact with certain substances must be avoided during the work.

Certain substances lead to corrosion in titanium zinc

Later, other components must be arranged or protected so that no corrosion can occur on the titanium zinc. In particular, the following pairings with titanium zinc should be considered:

  • Gypsum and sulphate-containing mortar or cement
  • Bitumen and plastic bitumen
  • different woods
  • different metals

If you ever wanted to remove zinc, you will know that it works relatively easily with different acids and alkalis. At first, it may be a bit irritating how substances such as wood, cement or bitumen can lead to corrosion of titanium zinc. However, it can contain or form acids that cause this corrosion of the titanium zinc.

For metals, direct contact with more noble metals should also be avoided. Upon contact of two different metals it comes to electrolysis and the resulting less noble metal takes over the role of the sacrificial anode. What is exploited in other applications, such as galvanizing itself, can not have negative effects on different components.

Gypsum and sulphate-containing cement or mortar

Although it is not allowed, gypsum is often added to conventional lime mortar to accelerate setting of the mortar. In winter, antifreeze additives, which may contain chlorides, are added. In the course of construction work there is a great risk that mortar residues, for example when working on the facade or on the roof, fall on titanium-galvanized components.

These spills must be removed immediately. If you wait too long, in the most favorable case, "only" strong discoloration occurs, which is quite visible on the façade and therefore unsightly. In the worst case, the corrosion process starts. The contact of mortar, cement, gypsum and antifreeze with titanium zinc must therefore be avoided.

Bitumen and plastic bitumen

Especially on the roof are often used as wall connection or roof finish and for fireplaces titanium galvanized sheets. On flat roofs and some conventional roofs but also bitumen and plastic bitumen roofing membranes are used for sealing. If this is the case, the processed and coated with titanium zinc sheet must be permanently protected.

In combination with UV radiation, various acids are produced on bitumen and plastic bitumen roofing membranes. If it comes to rain, the rainwater is contaminated accordingly. If this rainwater now also flows over a titanium zinc coating, the corrosion sets in. Therefore, titanium-galvanized metal parts in the vicinity of bitumen and bitumen roofing membranes are often additionally coated with plastic.

Titanium zinc and wood

It may be similar with some types of wood. There are a number of woods that are used on, in and around the house and on the roof, which are particularly acidic. If these acids reach the titanium zinc, this also leads to corrosion. Therefore, the direct contact is mandatory to avoid, also the titanium zinc coating should also be protected accordingly.

Special care should be taken with the following types of wood in connection with titanium-galvanized sheets and metals:

  • Oak: particularly high acid content
  • Red cedar (red cedar): particularly high acid content
  • Douglas (oak type): high acidity
  • Chestnut: high acidity
  • Larch: high acidity
  • Cedar (cedar): high acidity

Titanium galvanizing and other metals

The electrolysis does not always necessarily require direct contact. If the metal part with the higher metal is arranged in the direction of flow of the water first (ie above), electrolysis may also occur. Therefore, the use of copper and galvanized sheet is only conditionally permissible (please observe regulations). Conventional rust (iron oxides) pose no danger.

Tips & Tricks

Please keep in mind that the coatings you perform on the titanium sink surface are all limited in time and have different service lives depending on the coating used. This means that corresponding protective coatings on titanium zinc sheet or metal must be regularly renewed at appropriate intervals.

Video Board: Galvanic Corrosion | Forms of Corrosion