Investigation of the salinization of steel surfaces in marine environment

Abstract

The salinization and contamination of metal surfaces by chloride‐containing aerosols is of great importance with regard to corrosion phenomena of damaged coated metal surfaces and stainless steels in the maritime sector and in offshore applications. Detailed questions have to be answered to clarify whether and to what extent salinization of the surface has an influence on the adhesion and durability of coatings in repairing applications and on pitting occurrence on stainless steels under atmospheric conditions. The questions arise which degree of salinization is reached after which period of time and how a defined and reproducible salinization can be simulated in the laboratory for further systematic investigations. The article is dedicated to these questions. Results of a field trial on the Island of Heligoland are presented and a simple procedure for a defined loading of metal surfaces with chlorides at a laboratory scale using a design of experiments (DoE) approach is introduced.

Field exposure study under sheltered and open exposure conditions at different test sites in Germany: First‐year corrosion rate and atmospheric corrosivity

“…For the marine site HL, for example, a dependence of the amount of chloride deposited on the specimen inclination angle in the sheltered area was found in a previous study. [ 25 ] With a horizontal specimen inclination angle of the metal surface, about 5–10 times more chlorides are deposited on a metal surface in a marine atmosphere than with a vertical inclination angle.…”

“…The amount of chlorides and sulfates deposited on a metal surface was determined at the exposure racks for the exposure periods. This investigation was carried out as described in Babutzka et al [ 25 ] on separate test areas on the exposure racks made of stainless steel 1.4301 with rolled surface structure in the sheltered area. The amount of deposits was determined on horizontal surfaces in the sheltered area to obtain a statement about the supply of chloride and sulfate at the different exposure sites.…”

A framework for assessing the reliability of crack luminescence: an automated fatigue crack detection system

“…For this purpose, samples can be placed in a salt spray chamber or respectively a condensation chamber for different duration before fatigue testing. However, the transferability of the time the samples stay in the respective chambers is difficult to transfer into durations in reality [23].…”

Influence of airborne chlorides on concrete durability in the marine environment

“…Wet candle metoda najčešće je korištena metoda određivanja brzine nakupljanja klorida iz zraka [11]. Osjetljivija je na prisustvo natrijeva klorida i može sakupiti veću količinu klorida iz zraka [14,15]. Mjerna postaja je jednostavne izvedbe te oblika koji omogućava sakupljanje klorida iz zraka iz svih smjerova [6,16].…”