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Tips & Tricks

short and worth knowing

METALLIC PRECAST AND MACHINERY

Metallic precast or complete machines should be preserved as soon as possible.

CONSTANT TEMPERATURES

The packaging should be carried out in closed rooms with low humidity and constant temperatures. The metal should not be cooler than room temperature, otherwise the moisture in the room air will condense on the surface of the cooler metal and be packaged with it. The influence of gases, dirt and galvanic vapours should be kept away

FLASH RUST AT THE WEEKEND

During interim storage, overnight or at the weekend, corrosion-endangering parts must be covered with suitable NO-CORRO® products in order to prevent the formation of flash rust.

WE INCREASE THE GROSS SOCIAL PRODUCT

The research institutes estimate the annual corrosion damage caused to the European economy by improper conservation at about 2.5% of the gross national product!

NEW BUILDINGS

Take care when packing or storing in new buildings! The dampness of the wall can cause corrosion damage because chemical building materials often contain chlorides and other corrosive substances.

CRITICAL ZONES

During transport or longer storage in critical zones, products made of ferrous and non-ferrous metals are extremely susceptible to corrosion without suitable preservation.

Definition

Corrosion protection

Corrosion is a chemical or electrochemical process that is initiated and accelerated under the influence of oxygen and moisture. The source of corrosion is, among other things, the presence of certain corrosion-promoting media.

CORROSION-PROMOTING MEDIA

Air

  • humidity
  • oxygen
  • Industrial fumes
  • SO2
  • NOx

Water

  • Sea water
  • chlorinated
  • Drinking water
  • etc.

Acids

  • Pickles, solder and degreasers
  • free acids of the crate wood
  • galvanic baths near the packaging department
  • etc.

dust

Dust and dirt attract moisture and bind corrosive substances

Other:

Resinous oils and fats bind moisture

Hand perspiration

Contains chlorides, sulphates, phosphates as well as lactic, uric and fatty acids

PRECAUTIONS

The packaging specialist must know that corrosive media come into the company in many ways, so the company’s corrosion protection measures must be observed accordingly. Finger sweat marks are not immediately visible. Avoid touching rust-sensitive metal parts with unprotected hands. Canvas or preferably rubber gloves are recommended.

Definition

Water vapour

Atmospheric air always contains a certain amount of gaseous water and is therefore invisible as water vapour. How much water vapour is contained in the air essentially depends on meteorological and local conditions, but the air cannot absorb more than a certain amount of water vapour, measured in g/m³. If the maximum amount is reached, one speaks of air saturated with moisture. The moisture content in saturated air is 100% relative humidity.


Water vapour in the air

Temperature

Of decisive importance is the fact that the degree of saturation of the air with water vapour is highly temperature-dependent. The higher the air temperature, the more water vapour it can absorb; the lower the temperature, the lower the maximum possible water vapour content. Every drop in temperature creates condensation. If, for example, saturated air of 25°C and 100% humidity with a water vapour content of 23.04 g/m³ cools to 15°C, 10.22 grams of water per 1 m³ must be neutralised.

Specified in g/m³