Primer Selection & Intercoat Adhesion

What's the problem, Primer?

Primer is used to seal porous substrate, enhance wetting and adsorption, reduce exhaust risk and provide the necessary rust or interface on the metal surface. Primer is not as thick as possible, piles may affect curing and inter-story integration.

Different basis judgements

Concrete focus intensity, water content and pore; Metals focus on rust removal, roughness and cleaning; The old coatings focus on laminate attachment, compatibility and surface contamination. If this is not possible, a small area test should be performed.

recoat window

The next construction should be carried out in the premer state and within recoat window. After exceeding the window, finish cleaning, grinding or specialized interface processing based on TDS.

Attach Authentication

The specimens should use the same base materials treatment, formulation and maintenance conditions as the official works. Recording the location of destruction is more important than looking at values alone: destruction at substrate, damage at interfaces and damage at layers represent different issues.

Base Recognition Matches Primer

Primer's first task is to establish a reliable interface, but the mechanisms required for different building blocks are different. Concrete requires the closure of holes, wet pores and lower vents; Carbon steel needs to be protected against rust at prescribed cleanliness and roughness; Tightened surfaces such as zinc plating, stainless steel, aluminium and tiles rely more on clean, coarse and specialized interface chemistry. The maintenance of the old coatings must confirm whether the layer is solid, powdered, waxed or siliconed, and a small area test is used to verify solubility and interspecies. The selection of a generic base paint only is highly risky.

substrate testing should be carried out after grinding and cleaning. Concrete is concerned with intensity, water content and retour, metal is concerned with oil pollution, salinity, rust and roughness, and old paint is attached to compatibility. Primer is not a fixed number, with a large intake of porous substrate sources, and a thick, smooth, fragile membrane can easily result from overdose at the dense substrate. Construction should aim at even wetness, continuous closure and non-stocking, in two thin coatings if necessary. Local rapid drying was observed, indicating that gaps in pore or patching materials needed to be addressed separately.

recoat window and interface management

Recoat window indicates the time frame within which the lower channel material can be reliably integrated with the front layer. Early coverage of components that may trap solvents, bubbles or incomplete reactions; Late coverage loses chemical integration due to complete surface curing, pollution or surface degradation. The site should record the construction time in each area on the basis of material technical information and actual temperature. When the area is larger, partition labels or electronic records are used to prevent different groups from mistook “touch-dry” for arbitrary repetition.

Over and above windows there is usually a need to remove contamination, mechanical grinding to form even roughness and vacuuming, and some systems need to reuse interface materials. Sweat, dust, condensed water, demoulders and cleaning agent residues all weaken inter-story attachments. It should wait and be measured after rain or after washing, rather than looking only at the surface colour. The grinding must not leave only scattered marks, nor must it be worn through to the bottom. The edges, holes and hard-to-reach positions are supplemented by manual tools.

With test and abnormal treatment.

The test area shall replicate the base materials treatment, batches of materials, matching, tools, film thickness and maintenance conditions of the formal project. The values recorded in the extraction test are to be recorded in conjunction with the failure of the glue, the destruction of the substrate fusion, the destruction of the prmer interface or the destruction of the layers. The styling is suitable for some thin film and metal base materials, but is not a substitute for all pull evaluations. Test points should cover normal and risk areas and avoid selecting only the optimal surface location. The holes resulting from the tests are repaired at a complete level and are marked and stored.

If detachment occurs, the failure interface is identified, followed by water, pollution, surface treatment, matching, windows and maintenance. Continued coverage until the root causes are identified will only expand the scope of return work. When repaired, remove the solid boundary, plume the old membranes, and recover the compatibility of the primer and subsequent layers after cleaning. For systemic issues, large-scale construction should be suspended, batches and processes of nuclear material should be reinstated and models should be re-established. Clarifying the conditions for stoppage and resumption of work is an important element in controlling quality risks.

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.