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Accelerated Offshore Coating Performance Testing

Offshore is a very corrosive environment with a high corrosion rate. The offshore coating service life is relatively short and extremely expensive to apply maintenance coatings onsite.  A new accelerated coating corrosion test method is proposed.

Product Number: 51317--9134-SG
ISBN: 9134 2017 CP
Author: Benjamin Chang
Publication Date: 2017
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Offshore is a very corrosive environment with a high corrosion rate. The offshore coating longevity is relatively short (5 years) and extremely expensive to apply maintenance coatings onsite. It is an economic and effective measure to evaluate the performance of candidate coatings in an accelerated lab testing first to select the most qualified coatings.An effective accelerated lab testing should simulate the failure modes of the offshore coatings in the field. The major failure modes of offshore coatings are (1) high rust creepage at scribes (2) poor edge retention at the sharp edges corners and weld seams (3) thermal cycle cracking. For offshore maintenance coatings it is extremely difficult to reach a salt free steel substrates just by abrasive blast cleaning some residual salts are always remained on steel surfaces. The offshore maintenance coatings have to be salt tolerant.NACE has developed several test standards for offshore coatings- NACE TM0104 0204 0304 0404 and NACE SP0108 to cover both new construction and maintenance coatings for atmospheric splash zone and water immersion areas. Another international standard is ISO 20340. Their comparisons are also discussed in this paper.

Offshore is a very corrosive environment with a high corrosion rate. The offshore coating longevity is relatively short (5 years) and extremely expensive to apply maintenance coatings onsite. It is an economic and effective measure to evaluate the performance of candidate coatings in an accelerated lab testing first to select the most qualified coatings.An effective accelerated lab testing should simulate the failure modes of the offshore coatings in the field. The major failure modes of offshore coatings are (1) high rust creepage at scribes (2) poor edge retention at the sharp edges corners and weld seams (3) thermal cycle cracking. For offshore maintenance coatings it is extremely difficult to reach a salt free steel substrates just by abrasive blast cleaning some residual salts are always remained on steel surfaces. The offshore maintenance coatings have to be salt tolerant.NACE has developed several test standards for offshore coatings- NACE TM0104 0204 0304 0404 and NACE SP0108 to cover both new construction and maintenance coatings for atmospheric splash zone and water immersion areas. Another international standard is ISO 20340. Their comparisons are also discussed in this paper.

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