CoatingsPro Magazine

JUL 2017

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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Page 57 of 68

Delaminated paint chips were gathered from various locations to take back to a laboratory for further analysis. Holidays, pinholes, and delamination were also noted throughout the plant during the visual inspection. COATINGSPRO JULY 2017 57 evident. Thickly applied epoxies induce an internal sheer stress during curing. The thickly applied second intermediate coat would have developed internal stresses that would have exerted a shear force to effect a disbondment from the underlying layer of coating that it was intended to adhere to. • The epoxy coatings were applied in marginal environmental condi- tions and during cure fell below the required minimum temperatures. The first layer of epoxy intermediate coat was subjected to environmental conditions favorable for a contami- nate film formation on the surface during application and curing. ere are several things that the applicator could have done to have avoided this failure. e crew should have used a system where each layer of the coating is a different color to ensure proper coverage. ey also should apply each layer only to the specified thick- ness and no more. e use of wet film thickness gages could have helped with this. ey should have taken environ- mental readings throughout the day and painted when the temperatures and dew points offered an acceptable range with additional consideration to the environmental conditions during the curing phase of the coating. Now, the only feasible recommen- dation to ensure that the ship receives the intended objective and service life of the original "remove and replace" effort by the applicator is to remove the failing freeboard coating system and reinstall the specified system correctly with regard to dry film thickness and environmental conditions. ere was no problem with the specified system, only with its installation. CP D. Terry Greenfield is a pr incipa l consu ltant w it h Cor roMet r ics Ser v ices, Inc. Greenf ield has more t han 37 years' e x per ience in t he protect ive coat ings and cor rosion indust r y, prov id ing prog ram and project management, qua l it y assurance, cond it ion assessment and ma intenance planning , specif icat ion development, fa i lure ana lysis, e x per t w it ness, and t ra ining for t he mar ine, t ranspor ta- t ion, oi l and gas, and ot her indust r ies. Greenf ield is a g raduate of t he Universit y of Cent ra l Flor id a. He is a NACE Level III Coat ing Inspector w it h Br idge, Mar ine, and Nuc lear Specia lt ies. He hold s Of fshore and Shipboard Cor rosion A ssessment Technician cer t if icat ions, and he is a Societ y for Protect ive Coat ings (SSPC) Cer t if ied Protect ive Coat ings Specia l ist. For more infor mat ion, contact: Cor roMet r ics Ser v ices, Inc., +1 (251) 4 45-1562, w w w.cor romet r Ship Freeboard To be a part of this event, visit conference PDA's 2017 Annual Conference, October 4 – 6 at the DoubleTree by Hilton New Orleans, combines both educational and information content with an exhibition hall. During the two-day conference, PDA will offer Intro to Polyurea, Chemistry for the Contractor and Surface Preparation for Concrete and Steel on Wednesday, October 4. These courses are complimentary with a paid registration. Thursday kicks off a full day of general session with dynamic speakers and topics geared toward formulators applicators and distributors. PDA session topics include state of the industry, innovative coatings projects, and new formulas and processes. This conference provides an excellent opportunity to network with all the top professionals in the polyurea and coatings industries.

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