Long-lasting protection of the marine and high salt spray environment

It's not a single salt spray.

Marine installations are affected by both salinity, wet heat, ultraviolet light, dry and wet cycle and mechanical brushing. There are significant differences in the immersion time, oxygen supply and maintenance availability of different parts, and the coating system should be defined by partition.

Surface treatment and edge coverage

Soluble salt, oil pollution and revegetation should be specifically controlled in high salt environments. The sharp edges should be rounded and welds and connectors should be pre-painted to avoid low membrane thickness in geometry.

Select a weather-resistant topcoat

The exposed area should focus on photo-preserving, powdering and repainting performance; Long-term immersion areas need to identify product-specific hydrolysis, stability and associated bottoms. The test report should match the target medium and exposure pattern.

Inspection and repair

Create coating files by area to record initial film thickness, defective locations and maintenance materials. In the event that scratches, rust points, bubbles or edges are found to fail, the inspection is extended and partial repair is completed in a timely manner.

Maritime delimitation and risk identification

At a minimum, the marine environment should distinguish between atmospheric zones, spatter areas, tidal ranges and persistent immersion areas. Atmospheric zones are affected by salt deposition, ultraviolet light and condensation; Spattered areas with high oxygen, high salt and repeated wetting; (b) Dried and wet cycles and mechanical flushing in the flood zone; The leachate zone focuses on long-term water intake, hydrolysis and cathode protective compatibility. Different heights of the same component may be exposed to completely different corrosive drivers, so material selection, target film thickness and frequency of inspection are subject to zoning requirements rather than a single salt spray data coverage.

The project survey should also document the direction of the sea wind, wave levels, maintenance of accessibility, shut-down conditions, temperature differentials, solar radiation and biological contamination such as bird dung. Bridges, docks and offshore platforms have multiple nodes, and welds, bolts, drains and alien metal contact points are more likely to fail first. The design phase should optimize drainage, reduce salt platforms and allow space for later inspections. The coating is an important barrier, but structural details, seals and drainage together determine long-term performance.

Construction control and performance verification

Seaside construction must control soluble salt and decomposition. (c) Pre- and post-spray measurements of surface salinity, dust removal and prmer as soon as possible after treatment; The difference between air temperature, steel plate temperature, relative humidity and dew point continues to be recorded. When the wind is too high, the spray loses and contaminates the adjacent area, and steel is easily exposed at night or in the morning, and conditions should be set for a clear stoppage. The rewinding of the corner, welding and stripping can increase the actual film thickness of the weak position, followed by a window-linking of the coatings to avoid salinization.

Experimental validation is to simulate, as far as possible, a real failure combination. In addition to neutral salt mists, there is a combination of cyclic corrosive, ultraviolet aging, immersion, cold and thermal cycles, retention rates attached and spreading observations of scratches. The report needs to check the template base, the level of processing, each layer of material, the total thickness, the time of curing and the criteria for determination. A single number, such as 2000 hours, cannot be directly equated with the life of the site, and the engineering assumptions still require a combination of structure, construction quality, environmental grade and maintenance systems. Where necessary, exposure templates are set up on site for long-term tracking.

Inspection patches and full life management

The construction shall be completed by the creation of a building map that records the location of the spot film thickness, colour, batch, leak patches and photographs of the site. After operation, the inspection cycle is set by region, the atmospheric zone is concerned with pollination, loss of light and scratching, the spatter area is concerned with the failure of drums, rust points and edges, and the tide and immersion zone combines shut-off windows. Sequestration of salt avoids the use of high pressure distances and strong corrosive cleaning agents that damage coatings. All anomalies should be recorded in terms of size, location, speed of development and possible causes.

Local maintenance will delineate the edges and completely remove the salt, oil and lax layers, confirming that the remaining coatings are reliable and then restore the supporting layer. Only rust-point surface paints usually contain pollution and corrosive products under layers. Maintenance materials should be compatible with the original system and take into account hypothermia, high humidity and in situ operational periods. Maintenance can be placed in a controlled window through minor repairs, planned minor repairs and the necessary major repairs to grade management, avoiding the development of minor defects into extensive shutdown work.

Project landing and risk review

Prior to formal entry, the project leader shall organize a review of the design, materials, construction and user's common completion conditions and convert the drawing requirements into an on-site list of enforceable areas. The list contains, at a minimum, the type and state of the base materials, the target level and film thickness, the location of nodes, batches of materials, single batches, construction tools, division of labour, environmental control, repainting time and conditions of openness. Synchronization of cross-operations, temporary power, ventilation, fire protection and product protection to avoid interference with welding, cutting, dusting or installation of equipment. Following the completion of the first area of operation, a team self-check and technical review was conducted to compare actual usage, solidity and sample results and to confirm that there were no systemic deviations that could be carried out successively.

Quality management should have suspended inspection nodes instead of waiting for full coverage of the latter acceptance. The photographs and data are checked and stored before the substrate processes are completed, the Primer closures are closed, the defects are fixed, the key nodes are enhanced and the topcoat is delivered. In the event of an abnormal state of material, transboundary environment, batch changes or large area defects, the area shall be immediately isolated, samples and records maintained and the disposal method determined by the technicians. Any return to work will be accompanied by a breakdown interface, scope of processing, application of materials and results. The transformation of laboratory performance from stable to long-term use at the engineering site is achieved through piloting, process testimony, data marks and closed loop re-examination.