文献一覧: 13465066 (ISSN) - Ceek.jp Altmetrics

The authors conducted immersion tests on marine antifouling paint coatings at Tateyama (Chiba prefecture) and Ecchujima (Koto Ward, Tokyo) to investigate efficacy of antifouling coatings. Observation on bio fouling process of barnacles and measurement on leaching rate of antifouling agents from antifouling paint coatings were done throughout the tests. Leaching rate of antifouling agents was measured by apparatus that allows direct measurement from the flat panels. Chlorophyll-a (Chl.a) on immersed flat panels were also measured to estimate bio fouling of algae. And, the authors investigated 2 pure car carriers, container ship and training ship at regular dry dock to clarify actual ship's bio fouling of hull and niche places such as sea chests and rudder, etc. Leaching rate of antifouling agents from tested all marine antifouling paint coatings had been kept over abt.l0pg/cm^2/day for 1 year and barnacles had not stuck on paint coatings using antifouling agents of cuprous oxide(Cu_2O) . On the other hand, barnacles were observed on the coatings using antifouling agents of organic zinc in a minimum of about 100days and an average of about 250 days. The results of the immersion test clarified that efficacy of anti-fouling paint coatings could be estimate on leaching rate of antifouling agents and the rate over abt.10μg/cm^2/day of Cu_2O could prevent barnacles sticking on the anti-fouling paint coatings. Measurement on chlorophyll-a (Chl.a) could estimate quantity of algae stuck on tested panels in beginning of the immersion test. Barnacles and algae were observed on actual ship's hull and niche places of the investigated ships. Anti-fouling paint coatings using anti-fouling agent of Cu_2O were presume to be effective to prevent ship's bio fouling. The results of the investigation of actual ships clarified that ships have various surface conditions of antifouling paint coatings caused by ship's operation and structure that could be considered to cause bio fouling on ships.

2018-08-15 13:38:00
1 レファ協

https://ci.nii.ac.jp/naid/110009717620

1 0 0 0 IR 海水によるワイヤロープの腐食劣化の研究

著者: 山川賢次守谷敏之村上卓也早崎清志鯖江敏彦岡畑成樹井上新也神戸良三
出版者: 海上技術安全研究所
雑誌: 海上技術安全研究所報告 (ISSN:13465066)
巻号頁・発行日: vol.3, no.3, pp.287-367, 2003

A wire rope used in a marine environment has a great degradation due to corrosion. An accurate inspection is necessary to ensure the safety of wire ropes. However, technical background data of wire rope is quite few at present, and is not sufficient for wire rope inspection. Gathering the technical data is important to establish and ensure the offshore structure's maintenance technology including wire rope inspection. A laboratory test of wire rope degradation was carried out with seawater tanks for 5 years from 1994 to 1999. 14 types of ropes were used for the experiment. Further, an exposure test in real sea area was also carried out for 11 months in 1997 to acquire degradation data in dry zone above sea level, in ebb zone, and in the seawater zone. 8 types of ropes and 3 types of wires were used for the exposure test. During the test period, we examined the ropes for several times on the following characteristics, (1)appearance of ropes and strands, (2)cross section of each wire layers, (3)mechanical properties of ropes- rope diameter, breaking strength, elongation, (4)mechanical properties of wire: diameter, tensile strength, number of torsion (5)mass of coating. The changes of characteristic values are curve fitted with a line to eliminate fluctuation errors. We calculated most suitable characteristics values when the experiment is over and converted into normalized values divided by the initial values. Degradation of several kinds of wire rope was investigated with normalized characteristics values and observation results of wire rope and cross section.