Marine Corrosion Protection

Corrosion Protection SEO Vianden Quality of Coating Products Studies by the SEO Construction Department of Selected Products

Introduction ,[object Object],[object Object],[object Object],[object Object]

Main Topics ,[object Object],[object Object],[object Object],[object Object],[object Object]

Function of the coating materials ,[object Object],[object Object]

Properties of the coating materials ,[object Object],[object Object],[object Object],[object Object]

Diffusion and its consequences Functional mechanism ,[object Object],[object Object],[object Object],[object Object],[object Object]

Material transport through coatings Consequences for the coating ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Practical example : Ball valve pressure plate TU2, coated in 1999, partially stressed (with Sika Poxitar SW 200-250 µm), findings after eight years

Other factors can influence the diffusion process: ,[object Object],[object Object],[object Object],[object Object],[object Object]

The following counteract the diffusion process: ,[object Object],[object Object],[object Object],[object Object]

Test methods used for quality studies of substrate and coating material (at SEO) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Diffusion resistance / Δ -T Test: Test arrangement (thermodiffusion)

Diffusion resistance /  -T Test Of central importance for corrosion protection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Criteria in similar tests by the main RWE Laboratory Studies for the selection of products for coating the pressure lines 1 and 2 of the PS power plant Vianden 1997/98) ,[object Object]

Coating after diffusion of water (in the thermodiffusion test) Example: Tenaxon 555CS (version 2007, epoxy, solvent-based, average layer thickness 500 µm) Outside bath temperature 40°C/inside temperature in experimental tube 10°C Time period until the first bubbles appear: 2 days

Coating after diffusion of water in the thermodiffusion test (  -T Test) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Comparison of test tube test / WDD test according to DIN EN ISO 6270 (Water vapor (40°C) applied to plate, back side: air (20-25°C), layer thickness 500 µm, bubbles form after approximately 1 year in the case of ICOSIT) SIKA ICOSIT 500 SW ACOTEC HUMIDUR ML

Diffusion period in days until the appearance of bubbles on the coated surface in relation to the layer thickness in µm (Selection from more than 40 different tests and products until now)

Conclusions from the Table: Durability of the corrosion protection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Findings ,[object Object],[object Object],[object Object]

Selection criteria for application in the various water power plant sectors: ,[object Object],[object Object],[object Object],[object Object]

Application methods ,[object Object],[object Object],[object Object],[object Object],[object Object]

Environment and Health ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Advantages and disadvantages of the aforementioned products in comparison with one another: no no no yes no Allowed for drinking water R11/20/36/37/38/43/21/22/34/37/51/53/66/67/ R10/11/20/21/22/34/36/37/38/43/51/52/53/66 R34/43/20/22/36/38/43//51/53 R21/22/23/24/25/34/36/38/39/43/45/48/51/52/53/68/ R45 carcinogenic R groups / >15 >20 >20 >20 Adhesion strength N/mm2 90-120 poor 125 µm 450 µm VOC 130g/l 45 ++ Interzone 954 4/1vol 45 good / 450 µm VOC 28g/l 21 ~0 EPITER TF 130 4/1weight very poor 125 µm 450µm VOC168g/l >40 ++ Ceram-Kote54 6.7/1weight >90 ++++ (for 300 µm 35days.) 20 ~ Diffusion resistance in days for 500-600 µm 30 very good 40 good Processing Pot life at 18°C in min Manual processing / 350 µm / 370 µm Max. layer thickness Min. layer thickness none none Solvent content Aquapure HR 1/1 Humidur ML 1999 5/1weight

Next Steps ,[object Object],[object Object],[object Object],[object Object]

Marine Corrosion Protection

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